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Definition

Particulate matter that measures 2.5 micrometers in diameter or less is often called PM2.5. Particulate matter 10 (PM10) measures one-seventh the width of a strand of human hair, so one can imagine just how small PM2.5 really is. PM2.5 is composed of metals, allergens, nitrates, sulfates, organic chemicals, soil, and dust that are emitted from sources such as combustion products, soot from fireplaces, and blowing dust from construction sites and agricultural activities. PM2.5 levels are generally higher during the winter months due to weather, temperature, and inversions. The United States Environmental Protection Agency (EPA) PM2.5 standard states that daily averaged PM2.5 levels should not exceed 35 micrograms per cubic meter, while annually averaged PM2.5 levels should not exceed 12 micrograms per cubic meter^1^.[[br]] [[br]]

Numerator

This indicator report contains the following views: # Percent of days above the National Ambient Air Quality Standards (NAAQS) # Number of person-days above the NAAQS # Average annual ambient concentrations of PM2.5 # Percent of population living in counties exceeding NAAQS

Denominator

Where applicable, population based on U.S. Census Bureau estimates for July 1 of each year.

Data Interpretation Issues

Data on PM2.5 levels are only available where air monitors exist and when they are used. The Environmental Protection Agency (EPA) and the Utah Department of Environmental Quality (DEQ) have scientifically determined where in Utah PM2.5 is likely to exceed the standard. Geographies reported will vary based on measurement type. Data for this report represent ambient air, or outside air quality. The relationship between ambient concentrations and personal exposure can vary significantly depending upon the pollutant, activity patterns, and micro-environments. Data for this report came from the EPA; therefore, it may differ slightly from data to other sources. One reason for a possible difference is that this data includes [https://deq.utah.gov/air-quality/exceptional-events-program exceptional events], which includes air pollution generated from fireworks, construction, fires, and other sources.

Why Is This Important?

PM2.5 can get deep inside the lungs and cause a variety of symptoms, such as painful breathing, chest tightness, headache, and coughing. PM2.5 can exacerbate respiratory infections, trigger asthma attacks and symptoms, and cause temporary reductions in lung capacity. Respiratory symptoms are more likely to occur when PM2.5 levels exceed the EPA standard, but are possible when PM2.5 levels are below the standard, especially in sensitive populations. PM2.5 has been found to be associated with an increased risk of chronic lung disease^2^. In addition to these adverse outcomes, PM2.5 can influence the environment in ways that will eventually affect human health. Fine particles cause haze which reduces visibility. The long-term effects of PM2.5, which settles in the soil, natural water sources, forests, and agricultural areas, are still to be determined. Whether or not climate change has an effect on PM2.5 concentration has yet to be determined. However, as temperatures increase, PM2.5 concentration has been shown to increase in the United States, but this is not the general consensus of the scientific community. Researchers seem to agree that as precipitation increases, PM2.5 levels will decrease since it "clears" the air^3^. If precipitation events are seen to increase with climate change, it is reasonable to conclude that PM2.5 levels may decrease. PM2.5 concentrations could also be affected by air stagnation events (i.e., inversions). If air stagnation events increase in frequency with climate change, PM2.5 levels are likely to rise because these events trap the pollution at the Earth's surface^3^. More research is needed to accurately quantify to what extent PM2.5 levels will be affected by a changing climate.[[br]] [[br]]

Other Objectives

Physical exercise is essential to maintaining good health. In order to do this safely, refer to daily PM2.5 levels by checking them at [https://air.utah.gov/]. If PM2.5 levels are high, consider exercising indoors. If outdoor exercise is unavoidable during high PM2.5 levels, consider light to moderate activity such as walking.

How Are We Doing?

Several of the most urban counties in Utah have days that do not comply with the PM2.5 standard. This may be due in part to the unique geography and seasonal conditions in Utah. PM2.5 levels increase seasonally in the winter and often due to inversions. The Utah Department of Environmental Quality (DEQ) is working to decrease the number of days over the PM2.5 standard.

What Is Being Done?

The Utah Department of Environmental Quality (DEQ) is working to decrease PM2.5 emissions to comply with national standards. Because the majority of particulate matter is caused by automobile emissions, DEQ encourages the public to use mass transit and to stay indoors on days with high pollution levels, which you can check at [http://www.health.utah.gov/utahair]. In addition, DEQ has studied the effects of high particulate matter levels on children playing outside at recess so that schools may make informed decisions about when to keep children indoors. The DEQ 3-day air quality forecasting program uses a red, yellow, and green stoplight color code to inform the public about how they can help keep pollution levels low. A green day informs the public that pollution levels are low, and they can safely drive and spend time outside. A yellow day suggests citizens consider limiting their driving to reduce pollution levels. A red day strongly encourages the public to reduce driving and other polluting activities to prevent pollution levels from exceeding the health standard. Ultimately, air quality in Utah depends on each individual taking steps to reduce the amount of energy being used and pollution being emitted.

Available Services

The [http://www.health.utah.gov/utahair/ Air Quality and Public Health in Utah] web page provides a wide range of air quality-related topics. These topics include *[http://www.health.utah.gov/utahair/AQI/ Air Quality Index] *[http://www.health.utah.gov/utahair/pollutants/ Information about specific air pollutants] *Health effects from air pollution **[http://www.health.utah.gov/utahair/birthoutcomes/ Adverse birth outcomes] **[http://www.health.utah.gov/utahair/respiratory/#Asthma Asthma] **[http://www.health.utah.gov/utahair/respiratory/#COPD Chronic obstructive pulmonary disease] **[http://www.health.utah.gov/utahair/CAD/ Heart disease and heart attacks]

Related Indicators

Related Relevant Population Characteristics Indicators:

Related Health Care System Factors Indicators:

Asthma Management

Related Health Status Outcomes Indicators:

Graphical Data Views

PM2.5: Percent of Population Living in Counties Meeting the National Ambient Air Quality Standard, Utah, 2000-2021

This is a state-level measure that uses county-level annual average PM2.5 concentrations. In any given year, if a county has more than one air quality monitor, then the maximum annual average (among monitors with complete data) is assigned as the annual average for that county. The NAAQS annual standard is designated at 12 micrograms per cubic meter of air; this is the primary standard value^1^. Populations exposed to more than 12 micrograms per cubic meter of PM2.5 are considered to be "exceeding" the NAAQS. Primary air quality standards provide public health protection, including protecting the health of "sensitive" populations such as asthmatics, children, and the elderly^1^.[[br]] [[br]] ---- # Environmental Protection Agency (2016). National Ambient Air Quality Standards (NAAQS). Retrieved September 10, 2019 from the EPA: [https://www.epa.gov/criteria-air-pollutants/naaqs-table].[[br]] [[br]]

Meeting, Exceeding Monitoring, No	Year	Percent of Population
Record Count: 66
Meeting	2000	42.9%
Meeting	2001	28.3%
Meeting	2002	36.8%
Meeting	2003	37.2%
Meeting	2004	7.3%
Meeting	2005	44.6%
Meeting	2006	50.9%
Meeting	2007	24.9%
Meeting	2008	20.9%
Meeting	2009	18.8%
Meeting	2010	77.9%
Meeting	2011	91.1%
Meeting	2012	91.2%
Meeting	2013	22.0%
Meeting	2014	90.0%
Meeting	2015	90.0%
Meeting	2016	91.3%
Meeting	2017	91.3%
Meeting	2018	92.9%
Meeting	2019	91.2%
Meeting	2020	90.5%
Meeting	2021	92.0%
Exceeding	2000	40.1%
Exceeding	2001	60.8%
Exceeding	2002	52.3%
Exceeding	2003	39.2%
Exceeding	2004	79.9%
Exceeding	2005	42.7%
Exceeding	2006	38.3%
Exceeding	2007	64.3%
Exceeding	2008	68.3%
Exceeding	2009	70.4%
Exceeding	2010	12.4%
Exceeding	2011	0.0%
Exceeding	2012	0.0%
Exceeding	2013	68.5%
Exceeding	2014	0.0%
Exceeding	2015	0.0%
Exceeding	2016	0.0%
Exceeding	2017	0.0%
Exceeding	2018	0.0%
Exceeding	2019	0.0%
Exceeding	2020	0.0%
Exceeding	2021	0.0%
No Monitoring	2000	17.0%
No Monitoring	2001	10.8%
No Monitoring	2002	10.8%
No Monitoring	2003	23.6%
No Monitoring	2004	12.8%
No Monitoring	2005	12.6%
No Monitoring	2006	10.8%
No Monitoring	2007	10.8%
No Monitoring	2008	10.7%
No Monitoring	2009	10.8%
No Monitoring	2010	9.6%
No Monitoring	2011	8.9%
No Monitoring	2012	8.8%
No Monitoring	2013	9.4%
No Monitoring	2014	10.0%
No Monitoring	2015	10.0%
No Monitoring	2016	8.7%
No Monitoring	2017	8.7%
No Monitoring	2018	7.1%
No Monitoring	2019	8.8%
No Monitoring	2020	9.5%
No Monitoring	2021	8.0%

Data Notes

Counties were categorized as either "exceeding," "meeting," or "no monitoring" according to the mean annual PM2.5 concentration. The annual population percentage for each of the three aforementioned categories was derived by summing the total county population in each category, and dividing by the total state population

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Box Elder County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	2.3%
2001	5.9%
2002	5.8%
2003	0.0%
2004	4.9%
2005	0.4%
2006	1.0%
2007	1.0%
2008	2.5%
2009	2.5%
2010	4.2%
2011	2.5%
2012	0.0%
2013	5.3%
2014	1.4%
2015	0.9%
2016	1.5%
2017	2.5%
2018	1.1%
2019	**
2020	**
2021	**

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Cache County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	1.0%
2001	12.2%
2002	4.1%
2003	1.4%
2004	10.9%
2005	10.2%
2006	1.4%
2007	2.5%
2008	3.6%
2009	8.0%
2010	5.5%
2011	2.7%
2012	0.8%
2013	13.4%
2014	3.6%
2015	0.8%
2016	2.2%
2017	4.7%
2018	1.4%
2019	3.8%
2020	1.9%
2021	2.7%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Carbon County, 2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 1
2021	5.0%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Davis County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	3.3%
2001	5.9%
2002	6.7%
2003	2.3%
2004	6.6%
2005	4.4%
2006	1.0%
2007	2.5%
2008	1.6%
2009	6.2%
2010	4.3%
2011	1.7%
2012	0.0%
2013	9.1%
2014	3.4%
2015	1.1%
2016	1.6%
2017	2.8%
2018	0.3%
2019	0.3%
2020	1.6%
2021	2.2%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Duchesne County, 2011-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 11
2011	0.0%
2012	1.2%
2013	**
2014	0.3%
2015	0.3%
2016	0.0%
2017	0.3%
2018	0.8%
2019	0.0%
2020	1.1%
2021	1.4%

Data Notes

** Data not available. Percent reflects the percent of days sampled in the county during the year, not total days of the year. Data are not available prior to 2011 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Garfield County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	0.0%
2001	0.0%
2002	0.0%
2003	0.0%
2004	0.0%
2005	0.0%
2006	0.0%
2007	0.0%
2008	0.0%
2009	0.0%
2010	0.0%
2011	0.0%
2012	0.0%
2013	0.0%
2014	**
2015	0.0%
2016	0.0%
2017	0.0%
2018	0.0%
2019	0.0%
2020	**
2021	0.0%

Data Notes

** Data not available. Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Iron County, 2018-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 4
2018	0.0%
2019	0.0%
2020	0.0%
2021	0.8%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Salt Lake County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	6.4%
2001	8.1%
2002	9.5%
2003	2.2%
2004	10.7%
2005	9.1%
2006	3.6%
2007	6.0%
2008	3.8%
2009	6.6%
2010	4.7%
2011	4.4%
2012	0.6%
2013	10.4%
2014	3.8%
2015	1.4%
2016	4.1%
2017	3.8%
2018	1.6%
2019	1.1%
2020	1.9%
2021	3.6%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, San Juan County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	0.0%
2001	0.0%
2002	0.0%
2003	0.0%
2004	0.0%
2005	0.0%
2006	0.0%
2007	0.0%
2008	0.0%
2009	0.0%
2010	0.0%
2011	0.0%
2012	0.0%
2013	0.0%
2014	**
2015	0.0%
2016	0.0%
2017	0.0%
2018	0.0%
2019	0.0%
2020	**
2021	0.0%

Data Notes

** Data not available. Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Tooele County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	0.0%
2001	1.8%
2002	4.2%
2003	**
2004	**
2005	**
2006	0.0%
2007	0.4%
2008	0.9%
2009	2.2%
2010	1.6%
2011	0.8%
2012	0.0%
2013	3.5%
2014	0.0%
2015	0.0%
2016	0.6%
2017	0.3%
2018	1.1%
2019	0.3%
2020	1.1%
2021	2.7%

Data Notes

** Data not available. Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Uintah County, 2010-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 12
2010	0.0%
2011	0.0%
2012	1.1%
2013	0.0%
2014	**
2015	**
2016	0.0%
2017	0.0%
2018	0.0%
2019	0.0%
2020	0.3%
2021	1.1%

Data Notes

** Data not available. Percent reflects the percent of days sampled in the county during the year, not total days of the year. Data are not available prior to 2010 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Utah County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	1.7%
2001	6.2%
2002	4.5%
2003	0.9%
2004	6.7%
2005	2.6%
2006	1.9%
2007	6.0%
2008	2.7%
2009	4.9%
2010	1.9%
2011	2.5%
2012	0.6%
2013	8.8%
2014	1.1%
2015	0.8%
2016	3.0%
2017	1.6%
2018	4.4%
2019	0.3%
2020	1.4%
2021	2.5%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Washington County, 2001-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 21
2001	0.0%
2002	0.0%
2003	0.0%
2004	0.0%
2005	0.0%
2006	0.0%
2007	0.0%
2008	0.0%
2009	0.0%
2010	0.0%
2011	0.0%
2012	0.0%
2013	0.0%
2014	0.0%
2015	0.0%
2016	0.0%
2017	0.0%
2018	0.8%
2019	0.0%
2020	0.0%
2021	0.6%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Wayne County, 2001-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 21
2001	0.0%
2002	0.0%
2003	0.0%
2004	0.0%
2005	0.0%
2006	0.0%
2007	0.0%
2008	0.0%
2009	0.0%
2010	0.0%
2011	0.0%
2012	0.0%
2013	0.0%
2014	0.0%
2015	0.0%
2016	0.0%
2017	0.0%
2018	0.0%
2019	0.0%
2020	**
2021	0.0%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Weber County, 2000-2021

Year	Percent of Days Sampled Over NAAQS
Record Count: 22
2000	0.9%
2001	5.6%
2002	8.1%
2003	0.8%
2004	7.3%
2005	1.6%
2006	1.2%
2007	3.3%
2008	1.9%
2009	3.3%
2010	4.9%
2011	3.0%
2012	0.8%
2013	9.3%
2014	1.4%
2015	1.8%
2016	3.0%
2017	2.5%
2018	0.6%
2019	0.4%
2020	0.6%
2021	2.0%

Data Notes

Percent reflects the percent of days sampled in the county during the year, not total days of the year.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Box Elder County, 2001-2021

Year	Person-days
Record Count: 21
2001	930,635
2002	930,677
2003	0
2004	802,112
2005	133,309
2006	276,722
2007	294,555
2008	441,988
2009	558,644
2010	485,269
2011	410,705
2012	0
2013	992,462
2014	260,286
2015	170,268
2016	291,850
2017	486,539
2018	220,624
2019	**
2020	**
2021	**

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Cache County, 2000-2021

Year	Person-days
Record Count: 22
2000	352,057
2001	4,123,599
2002	1,425,567
2003	503,274
2004	3,929,298
2005	3,748,989
2006	506,231
2007	934,222
2008	1,388,071
2009	3,200,369
2010	2,267,947
2011	1,147,855
2012	346,880
2013	5,711,171
2014	1,532,071
2015	358,484
2016	982,607
2017	2,136,895
2018	635,404
2019	1,796,046
2020	910,028
2021	1,372,550

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Carbon County, 2021

Year	Person-days
Record Count: 1
2021	204,880

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Davis County, 2000-2021

Year	Person-days
Record Count: 22
2000	2,922,209
2001	5,296,128
2002	6,078,487
2003	**
2004	6,325,703
2005	4,274,350
2006	946,387
2007	2,588,071
2008	1,759,868
2009	6,822,446
2010	4,798,869
2011	1,980,483
2012	0
2013	10,691,805
2014	4,103,861
2015	1,343,724
2016	2,054,154
2017	3,481,818
2018	346,613
2019	355,481
2020	2,155,392
2021	2,943,552

Data Notes

** Data not available. Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Duchesne County, 2011-2021

Year	Person-days
Record Count: 11
2011	0
2012	81,850
2013	**
2014	20,651
2015	21,970
2016	0
2017	20,353
2018	60,481
2019	0
2020	79,576
2021	98,690

Data Notes

** Data not available. Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5. Data are not available prior to 2011 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Garfield County, 2000-2021

Year	Person-days
Record Count: 22
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	**
2021	0

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Iron County, 2018-2021

Year	Person-days
Record Count: 4
2018	0
2019	0
2020	0
2021	183,696

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Salt Lake County, 2000-2021

Year	Person-days
Record Count: 22
2000	21,212,216
2001	26,893,081
2002	31,736,383
2003	7,561,181
2004	36,619,222
2005	31,451,990
2006	12,562,573
2007	21,651,163
2008	13,973,251
2009	24,420,366
2010	17,569,940
2011	16,747,294
2012	2,136,022
2013	41,137,066
2014	15,281,042
2015	5,513,696
2016	16,771,036
2017	15,947,685
2018	6,899,661
2019	4,641,748
2020	8,158,619
2021	15,568,163

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, San Juan County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	**
2021	0

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Tooele County, 2000-2021

Year	Person-days
Record Count: 22
2000	0
2001	276,777
2002	684,892
2003	**
2004	**
2005	**
2006	0
2007	86,437
2008	183,661
2009	457,372
2010	350,187
2011	179,292
2012	0
2013	781,226
2014	0
2015	0
2016	136,621
2017	66,440
2018	280,677
2019	72,259
2020	298,048
2021	761,560

Data Notes

** Data not available. Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Uintah County, 2010-2021

Year	Person-days
Record Count: 12
2010	0
2011	0
2012	137,819
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	35,970
2021	143,900

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5. Data are not available prior to 2009 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Utah County, 2000-2021

Year	Person-days
Record Count: 22
2000	2,279,945
2001	8,699,581
2002	6,567,338
2003	1,274,930
2004	10,163,468
2005	4,071,594
2006	3,141,658
2007	10,352,228
2008	4,858,840
2009	9,083,642
2010	3,644,118
2011	4,784,147
2012	1,083,456
2013	17,648,445
2014	2,251,415
2015	1,713,941
2016	6,504,474
2017	3,630,527
2018	9,947,319
2019	636,235
2020	3,255,295
2021	6,152,625

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Washington County, 2001-2021

Year	Person-days
Record Count: 21
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	526,432
2019	0
2020	0
2021	378,864

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Wayne County, 2001-2021

Year	Person-days
Record Count: 21
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	**
2021	0

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Weber County, 2000-2021

Year	Person-days
Record Count: 22
2000	648,581
2001	4,060,281
2002	5,973,381
2003	607,026
2004	5,551,840
2005	1,257,958
2006	962,481
2007	2,628,536
2008	1,567,521
2009	2,739,355
2010	4,177,225
2011	2,577,530
2012	707,138
2013	8,099,448
2014	1,201,180
2015	1,614,003
2016	2,671,321
2017	2,270,698
2018	514,641
2019	260,213
2020	525,316
2021	1,859,445

Data Notes

Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for PM2.5.

Data Sources

U.S. Environmental Protection Agency, Air Quality System (AQS)
Population Estimates: National Center for Health Statistics (NCHS) through a collaborative agreement with the U.S. Census Bureau, IBIS Version 2018

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Box Elder County, 2001-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 21
2001	9.31
2002	10.64
2003	7.09
2004	10.1
2005	7.99
2006	8.1
2007	8.79
2008	7.87
2009	9.24
2010	8.75
2011	8.44
2012	6.88
2013	9.54
2014	6.11
2015	5.92
2016	7.7
2017	8.93
2018	8.57
2019	**
2020	**
2021	**

Data Notes

Average ambient concentrations are calculated by collecting monitoring sites with complete quarterly and annual data. Quarterly averages are calculated, then the average of these four values results in the annual average for a county. If there are multiple monitors in a county, the one with the highest annual average is used.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Cache County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	8.7
2001	15.6
2002	14.6
2003	8.3
2004	15.1
2005	13.24
2006	10.8
2007	11.53
2008	13.81
2009	14.69
2010	14
2011	11.97
2012	10
2013	17.67
2014	8.79
2015	8.48
2016	8.7
2017	9.97
2018	9.39
2019	8.2
2020	9.63
2021	9.78

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Carbon County, 2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 1
2021	8.8

Data Notes

** Data unavailable. Average ambient concentrations are calculated by collecting monitoring sites with complete quarterly and annual data. Quarterly averages are calculated, then the average of these four values results in the annual average for a county. If there are multiple monitors in a county, the one with the highest annual average is used.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Davis County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	9.04
2001	10.07
2002	11.36
2003	**
2004	13.31
2005	10.29
2006	9.15
2007	11.92
2008	10.57
2009	10.36
2010	9.42
2011	8.55
2012	8.21
2013	11
2014	7.5
2015	6.69
2016	8.4
2017	9.38
2018	8.45
2019	6.27
2020	9.48
2021	9.51

Data Notes

** Data not available. Average ambient concentrations are calculated by collecting monitoring sites with complete quarterly and annual data. Quarterly averages are calculated, then the average of these four values results in the annual average for a county. If there are multiple monitors in a county, the one with the highest annual average is used.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Duchesne County, 2011-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 11
2011	4.6
2012	7.5
2013	**
2014	5.7
2015	6.0
2016	6.0
2017	6.2
2018	6.8
2019	6.1
2020	7.6
2021	7.6

Data Notes

** Data not available. Data are not available prior to 2011 because either there were no air monitors in the county or 8-hour averages were not collected. Average ambient concentrations are calculated by collecting monitoring sites with complete quarterly and annual data. Quarterly averages are calculated, then the average of these four values results in the annual average for a county. If there are multiple monitors in a county, the one with the highest annual average is used.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Garfield County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	2.7
2001	2.7
2002	2.8
2003	2.3
2004	2.4
2005	2.4
2006	2.5
2007	3.0
2008	2.9
2009	3.0
2010	2.1
2011	2.3
2012	2.6
2013	2.3
2014	2.1
2015	2.1
2016	2.1
2017	2.3
2018	2.5
2019	2.6
2020	**
2021	3.2

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Iron County, 2018-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 4
2018	4.8
2019	4.3
2020	5.4
2021	6.5

Data Notes

** Data unavailable. Data are not available prior to 2018 because either there were no air monitors in the county or 8-hour averages were not collected. Average ambient concentrations are calculated by collecting monitoring sites with complete quarterly and annual data. Quarterly averages are calculated, then the average of these four values results in the annual average for a county. If there are multiple monitors in a county, the one with the highest annual average is used.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Salt Lake County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	14.2
2001	14.1
2002	15.4
2003	12.3
2004	17.8
2005	14.1
2006	13.0
2007	13.4
2008	12.4
2009	13.0
2010	10.6
2011	9.0
2012	9.0
2013	12.8
2014	8.0
2015	8.7
2016	9.5
2017	9.5
2018	10.0
2019	9.0
2020	10.5
2021	11.1

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), San Juan County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	2.9
2001	3.0
2002	3.8
2003	2.9
2004	2.5
2005	2.5
2006	2.6
2007	3.1
2008	3.0
2009	2.9
2010	2.5
2011	2.4
2012	3.1
2013	2.5
2014	2.5
2015	2.3
2016	2.0
2017	2.5
2018	2.9
2019	2.0
2020	**
2021	3.8

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Tooele County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	7.1
2001	7.9
2002	9.4
2003	**
2004	**
2005	**
2006	6.6
2007	7.3
2008	10.4
2009	12.2
2010	10.9
2011	7.2
2012	7.6
2013	9.2
2014	6.3
2015	5.2
2016	6.3
2017	7.5
2018	8.6
2019	5.7
2020	7.7
2021	8.6

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Uintah County, 2010-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 12
2010	7.5
2011	7.2
2012	7.9
2013	8.9
2014	**
2015	**
2016	5.7
2017	5.7
2018	5.6
2019	5.2
2020	6.6
2021	7.3

Data Notes

** Data unavailable. Data are not available prior to 2010 because either there were no air monitors in the county or 8-hour averages were not collected. Average ambient concentrations are calculated by collecting monitoring sites with complete quarterly and annual data. Quarterly averages are calculated, then the average of these four values results in the annual average for a county. If there are multiple monitors in a county, the one with the highest annual average is used.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Utah County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	10.1
2001	11.8
2002	11.6
2003	9.2
2004	12.9
2005	10.2
2006	10.5
2007	13.6
2008	12.7
2009	12.2
2010	10.4
2011	10.6
2012	9.8
2013	12.8
2014	7.4
2015	8.5
2016	8.9
2017	9.0
2018	8.9
2019	6.5
2020	8.5
2021	8.5

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Washington County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	2.6
2001	3.3
2002	3.4
2003	3.4
2004	2.8
2005	2.9
2006	3.3
2007	3.9
2008	3.6
2009	3.7
2010	3.7
2011	4.3
2012	6.0
2013	4.0
2014	4.6
2015	4.7
2016	5.2
2017	4.9
2018	6.5
2019	4.4
2020	5.8
2021	5.9

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Wayne County, 2001-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 21
2001	2.8
2002	2.8
2003	2.6
2004	3.0
2005	2.6
2006	2.8
2007	3.0
2008	3.0
2009	2.7
2010	2.2
2011	2.4
2012	3.0
2013	2.4
2014	2.3
2015	2.3
2016	2.3
2017	2.5
2018	3.0
2019	2.0
2020	**
2021	3.5

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5: Average Ambient Concentrations (based on seasonal averages and daily measurement), Weber County, 2000-2021

Year	Average Ambient Concentration (mcg/cubic meter)
Record Count: 22
2000	7.9
2001	10.4
2002	14.5
2003	10.0
2004	13.9
2005	10.5
2006	9.4
2007	12.8
2008	12.3
2009	13.4
2010	12.4
2011	10.5
2012	10.2
2013	14.4
2014	10.7
2015	10.0
2016	9.2
2017	9.2
2018	9.0
2019	6.0
2020	7.4
2021	8.9

Data Notes

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Box Elder County, 2000-2021

Year	Number of Days Exceeded
Record Count: 21
2001	7
2002	7
2003	0
2004	6
2005	1
2006	2
2007	2
2008	3
2009	4
2010	9
2011	8
2012	0
2013	18
2014	5
2015	3
2016	4
2017	9
2018	4
2019	**
2020	**
2021	**

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Cache County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	1
2001	14
2002	11
2003	5
2004	39
2005	37
2006	5
2007	9
2008	13
2009	29
2010	20
2011	10
2012	3
2013	44
2014	13
2015	3
2016	8
2017	17
2018	5
2019	14
2020	7
2021	10

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Carbon County, 2021

Year	Number of Days Exceeded
Record Count: 1
2021	10

Data Notes

** Data not available. These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Davis County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	4
2001	7
2002	8
2003	**
2004	8
2005	5
2006	1
2007	3
2008	2
2009	7
2010	5
2011	2
2012	0
2013	10
2014	4
2015	3
2016	6
2017	10
2018	1
2019	1
2020	6
2021	8

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Duchesne County, 2011-2021

Year	Number of Days Exceeded
Record Count: 11
2011	0
2012	3
2013	**
2014	1
2015	1
2016	0
2017	1
2018	3
2019	0
2020	4
2021	5

Data Notes

** Data not available. These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. Data are not available prior to 2011 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Garfield County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	**
2021	0

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Iron County, 2018-2021

Year	Number of Days Exceeded
Record Count: 4
2018	0
2019	0
2020	0
2021	3

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Salt Lake County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	22
2001	28
2002	34
2003	8
2004	39
2005	33
2006	13
2007	22
2008	14
2009	24
2010	17
2011	16
2012	2
2013	38
2014	14
2015	5
2016	15
2017	14
2018	6
2019	4
2020	7
2021	13

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, San Juan County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	**
2021	0

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Tooele County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	0
2001	2
2002	5
2003	**
2004	**
2005	**
2006	0
2007	1
2008	3
2009	8
2010	6
2011	3
2012	0
2013	12
2014	0
2015	0
2016	2
2017	1
2018	4
2019	1
2020	4
2021	10

Data Notes

** Data not available. These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Uintah County, 2010-2021

Year	Number of Days Exceeded
Record Count: 12
2010	0
2011	0
2012	4
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	1
2021	4

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. Data are not available prior to 2010 because either there were no air monitors in the county or 8-hour averages were not collected.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Utah County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	6
2001	22
2002	16
2003	3
2004	24
2005	9
2006	7
2007	22
2008	10
2009	18
2010	7
2011	9
2012	2
2013	32
2014	4
2015	3
2016	11
2017	6
2018	16
2019	1
2020	5
2021	9

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Washington County, 2001-2021

Year	Number of Days Exceeded
Record Count: 21
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	2

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Wayne County, 2001-2021

Year	Number of Days Exceeded
Record Count: 21
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	**
2021	0

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

Average PM2.5 Levels Over the National Ambient Air Quality Standard: Number of Days by Year, Weber County, 2000-2021

Year	Number of Days Exceeded
Record Count: 22
2000	1
2001	7
2002	10
2003	1
2004	9
2005	2
2006	4
2007	12
2008	7
2009	12
2010	18
2011	11
2012	3
2013	34
2014	5
2015	6
2016	10
2017	9
2018	2
2019	1
2020	2
2021	7

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc.

Data Source

U.S. Environmental Protection Agency, Air Quality System (AQS)

References and community resources

'''Air Quality and Public Health in Utah'''[[br]] This Utah Department of Health Website provides information on particulate matter, its sources, ways to reduce exposure, and trend data.[[br]] [http://www.health.utah.gov/utahair/pollutants/PM/] '''AirNow'''[[br]] This U.S. Government website provides information on air quality from a collaboration of different agencies.[[br]] [http://www.airnow.gov] '''Choose Clean Air Utah'''[[br]] This Utah Department of Environmental Quality website provides information about air pollution in Utah and information on how to make healthy choices.[[br]] [https://air.utah.gov/] '''Environmental Protection Agency (EPA)'''[[br]] These EPA web pages provide information about particulate matter (PM), adverse health effects, research, and regulations.[[br]] [https://www.epa.gov/pm-pollution/particulate-matter-pm-basics] '''Centers for Disease Control and Prevention (CDC)'''[[br]] These CDC websites provide information about specific air pollutants and the way it can harm human health.[[br]] *[http://www.cdc.gov/air/pollutants.htm Air Pollutants] *[http://www.cdc.gov/air/ Air Quality][[br]] [[br]] Citations:[[br]] # Environmental Protection Agency (2016). National Ambient Air Quality Standards (NAAQS). Retrieved November 18, 2016 from the EPA: [https://www.epa.gov/criteria-air-pollutants/naaqs-table]. # Utah Department of Health (2019). Particulate Matter (PM): Health Effects - Air Pollution and Public Health in Utah. Retrieved November 14, 2019 from [http://www.health.utah.gov/utahair/pollutants/PM/index.html#Health]. # Jacob DJ & Winner DA. (2009) Effect of climate change on air quality. Atmospheric Environment 43(1), 51-63.

Data queries

Publications search

Complete Health Indicator Report of Air Quality: Particulate Matter (PM2.5)

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Graphical Data Views

PM2.5: Percent of Population Living in Counties Meeting the National Ambient Air Quality Standard, Utah, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Box Elder County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Cache County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Carbon County, 2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Davis County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Duchesne County, 2011-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Garfield County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Iron County, 2018-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Salt Lake County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, San Juan County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Tooele County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Uintah County, 2010-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Utah County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Washington County, 2001-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Wayne County, 2001-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Percent of Days by Year, Weber County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Box Elder County, 2001-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Cache County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Carbon County, 2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Davis County, 2000-2021

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PM2.5 Levels Over the National Ambient Air Quality Standard: Person-days by Year, Duchesne County, 2011-2021

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