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Definition

The United States Environmental Protection Agency (EPA) ozone standard states that the 8-hour average ozone level should not exceed 0.070 ppm. These standard levels are often referred to as the National Ambient Air Quality Standards (NAAQS). This level is considered protective for most people and within the normal defensive capacities of the human respiratory system.^1-3^[[br]] [[br]] ---- 1. McDonnell, et al. (1997) Prediction of ozone-induced FEV1 changes: Effects of concentration, duration and ventilation. American Journal of Respiratory and Critical Care Medicine. Vol 156, 715-722.[[br]] 2. Mudway, et.al. (2001) Differences in basal airway antioxidant concentrations are not predictive of individual responsiveness to ozone: A comparison of healthy and mild asthmatic subjects. Free Radical Biology and Medicine, Vol 31, No. 8. 962-974.[[br]] 3. Mudway, I and Kelly, F. J. (2004) An investigation of inhaled ozone dose and the magnitude of airway inflammation in healthy adults. American Journal of Respiratory and Critical Care Medicine, Vol 169, 1089-1095.

Numerator

This Indicator Report contains the following variables:[[br]] 1. Number of days with maximum 8-hour average ozone concentrations above the National Ambient Air Quality Standards (NAAQS) by county[[br]] 2. Number of person-days with maximum 8-hour average ozone concentrations above the NAAQS by county

Denominator

When applicable, the population was obtained from the IBIS query system for appropriate years by county.

Data Interpretation Issues

Data on ozone levels are only available where air monitors exist. These monitors do not cover the entire state. The monitors may not measure ozone levels year-round, as the national standard is to measure mostly during summer months. These data include "exceptional events" such as high winds, fires, construction, fireworks, etc. These values represent days when at least one air monitoring station showed a reading over the National Ambient Air Quality Standard (NAAQS) within a county. Each county that had data was used to calculate the percentage of Utah counties that had at least one day where ozone was above the NAAQS. This report uses the 2015 primary and secondary NAAQS of 0.070 parts per million (ppm). For more information on the ozone NAAQS, please visit the [https://www.epa.gov/criteria-air-pollutants/naaqs-table EPA NAAQS Table] and the [https://www.epa.gov/ozone-pollution/table-historical-ozone-national-ambient-air-quality-standards-naaqs Table of Historical Ozone NAAQS] Data for this report represent ambient air (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 and therefore may differ slightly from data from other sources.

Why Is This Important?

Ozone is a naturally occurring component of the earth's atmosphere at ground level and in the upper regions of the atmosphere. While upper atmospheric ozone protects the earth from the sun's harmful rays, ground-level ozone can be detrimental to the health of plants, animals, and human beings. Molecules of ozone are made up of three oxygen atoms (O3) and are chemically identical in the upper atmosphere and at ground level. The lungs of animals and humans have a thin liquid lining that protects the lung tissue from normal amounts of ozone. However, sunlight and heat can create new ground-level ozone molecules from nitrogen oxides and volatile organic chemicals that are found naturally at the earth's surface, as well as in emissions from industrial facilities, electric utilities, motor vehicle exhaust, gasoline vapors, and chemical solvents in urbanized regions. Ozone is a principal component of urban smog and is measured in parts per million (ppm). Ozone can cause several adverse health effects in anyone, but especially in sensitive populations such as children, older adults, people with pre-existing lung diseases such as asthma, and people who are physically active outdoors. Some of these health problems include painful breathing, chest tightness, headache, coughing, increased asthma symptoms, lung inflammation, and temporary reduction in lung capacity. Over time, ozone is associated with chronic lung problems and respiratory infections. Adverse health effects from ozone are more likely to occur when ozone levels exceed the EPA standard but are possible when ozone levels are below the standard, especially in sensitive populations. Ground-level ozone, not to be confused with the atmosphere's protective ozone layer, is created by reactions between environmental pollutants, light, and heat. Ozone is the main component of smog and is dangerous to health and the environment. The creation of ozone is facilitated by warm weather and sunshine; therefore, ozone levels are usually higher in the summer and in the mid-afternoon. Climate change may play a part in the creation of more ground-level ozone pollution. As temperatures increase, it is expected that the number of high ozone days will increase, since heat accelerates the nitrogen oxide and volatile organic compound reaction.^1^ Researchers have found that a combination of higher temperatures, sunlight, emissions, and air stagnation events (i.e., inversions) may result in an increase in ozone levels. However, more research is needed to accurately gauge what portion of ozone is actually increasing solely due to climate change.[[br]] [[br]] ---- 1. National Aeronautics and Space Administration (2004). The good, the bad and the ozone. Retrieved March 21, 2012 from the National Aeronautics and Space Administration: [http://www.nasa.gov/missions/earth/f-ozone.html]

Other Objectives

Physical exercise is essential to maintaining good health. In order to exercise safely, Utahns should refer to daily ozone levels by checking them at [https://air.utah.gov/]. If ozone levels are high, consider exercising indoors. The best time to exercise outdoors during the summer months is before noon or after 6:00 p.m. If outdoor exercise is unavoidable during high ozone levels, consider light to moderate activity such as walking.

How Are We Doing?

Most urban counties in Utah often have days that do not comply with the new ozone standard of 0.070 ppm. The Utah Department of Environmental Quality (DEQ) is working to decrease the number of days over the ozone standard.

What Is Being Done?

In response to the new EPA ozone standard of 0.070 ppm, DEQ has begun fitting school buses with cleaner technology, and state office buildings have begun adopting more energy-efficient policies and practices. 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 and safe. A green day informs the public that pollution levels are low, and they can safely drive and spend time outside. A yellow day informs the public that they should consider limiting 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, the air quality for Utah citizens is dependent upon each individual taking steps to reduce the amount of energy used and pollution emitted.

Available Services

Find out about current air quality conditions in your county by going to [https://air.utah.gov/]. This can help you make informed decisions about your health. The Utah DEQ 3-day air quality forecasting is available at [https://air.utah.gov/forecast.php]. This forecast helps the public make smart decisions under current air quality conditions. People can use this information to choose when to stay indoors and whether to use mass transit.

Related Indicators

Related Relevant Population Characteristics Indicators:

Related Health Care System Factors Indicators:

Asthma Management

Related Health Status Outcomes Indicators:

Graphical Data Views

Maximum 8-hour average ozone concentrations above the National Ambient Air Quality Standard (NAAQS), Number of days by county, Utah, 2021

County	Number of Days exceeding NAAQS
Record Count: 14
Box Elder	4
Cache	1
Carbon	4
Davis	21
Duchesne	5
Garfield	2
Iron	2
Salt Lake	39
San Juan	2
Tooele	9
Uintah	8
Utah	14
Washington	2
Weber	10

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] These values represent days when at least one air monitoring station showed a reading over the National Ambient Air Quality Standard (NAAQS) for ozone within a county.

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Box Elder County, 2001-2021

Year	Number of Days Above Standard
Record Count: 21
2001	19
2002	32
2003	21
2004	2
2005	22
2006	15
2007	20
2008	10
2009	2
2010	4
2011	1
2012	15
2013	5
2014	2
2015	3
2016	1
2017	3
2018	9
2019	0
2020	3
2021	4

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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Cache County, 2000-2021

Year	Number of Days Above Standard
Record Count: 22
2000	12
2001	3
2002	4
2003	9
2004	1
2005	3
2006	6
2007	14
2008	2
2009	0
2010	0
2011	0
2012	6
2013	1
2014	0
2015	2
2016	0
2017	0
2018	3
2019	0
2020	2
2021	1

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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Carbon County, 2011-2021

Year	Number of Days Above Standard
Record Count: 11
2011	2
2012	11
2013	2
2014	0
2015	3
2016	0
2017	0
2018	6
2019	1
2020	0
2021	4

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Davis County, 2000-2021

Year	Number of Days Above Standard
Record Count: 22
2000	25
2001	23
2002	24
2003	17
2004	1
2005	29
2006	17
2007	16
2008	15
2009	6
2010	5
2011	2
2012	2
2013	0
2014	8
2015	4
2016	10
2017	24
2018	15
2019	5
2020	10
2021	21

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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Duchesne County, 2011-2021

Year	Number of Days Above Standard
Record Count: 11
2011	24
2012	8
2013	44
2014	2
2015	2
2016	8
2017	9
2018	9
2019	12
2020	1
2021	5

Data Notes

Data Source

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Garfield County, 2011-2021

Year	Number of Days Above Standard
Record Count: 11
2011	0
2012	3
2013	2
2014	0
2015	2
2016	**
2017	3
2018	3
2019	0
2020	0
2021	2

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] ^ ^**The estimate has been suppressed because 1) the relative standard error is greater than 50% or 2) the observed number of events is very small and not appropriate for publication. 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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Iron County, 2018-2021

Year	Number of Days Above Standard
Record Count: 4
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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Salt Lake County, 2000-2021

Year	Number of Days Above Standard
Record Count: 22
2000	35
2001	27
2002	34
2003	32
2004	18
2005	31
2006	45
2007	41
2008	18
2009	19
2010	7
2011	19
2012	24
2013	14
2014	7
2015	22
2016	14
2017	36
2018	44
2019	12
2020	15
2021	39

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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, San Juan County, 2000-2021

Year	Number of Days Above Standard
Record Count: 22
2000	12
2001	1
2002	8
2003	12
2004	5
2005	3
2006	4
2007	6
2008	3
2009	3
2010	2
2011	3
2012	8
2013	0
2014	1
2015	1
2016	0
2017	1
2018	9
2019	0
2020	2
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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Tooele County, 2005-2021

Year	Number of Days Above Standard
Record Count: 17
2005	10
2006	12
2007	12
2008	4
2009	5
2010	4
2011	6
2012	7
2013	4
2014	3
2015	4
2016	6
2017	17
2018	8
2019	1
2020	2
2021	9

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Data are not available prior to 2005 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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Uintah County, 2007-2021

Year	Number of Days Above Standard
Record Count: 15
2007	0
2008	0
2009	2
2010	49
2011	35
2012	13
2013	63
2014	8
2015	2
2016	12
2017	11
2018	13
2019	17
2020	2
2021	8

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Data are not available prior to 2007 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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Utah County, 2000-2021

Year	Number of Days Above Standard
Record Count: 22
2000	28
2001	22
2002	24
2003	35
2004	7
2005	14
2006	31
2007	22
2008	12
2009	5
2010	8
2011	0
2012	14
2013	12
2014	10
2015	14
2016	8
2017	8
2018	22
2019	0
2020	3
2021	14

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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Washington County, 2004-2021

Year	Number of Days Above Standard
Record Count: 18
2004	14
2005	20
2006	10
2007	5
2008	9
2009	3
2010	9
2011	6
2012	13
2013	5
2014	1
2015	3
2016	0
2017	1
2018	2
2019	0
2020	3
2021	2

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Data are not available prior to 2004 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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Weber County, 2000-2021

Year	Number of Days Above Standard
Record Count: 22
2000	23
2001	17
2002	27
2003	26
2004	7
2005	23
2006	31
2007	32
2008	14
2009	5
2010	7
2011	14
2012	25
2013	12
2014	7
2015	9
2016	12
2017	20
2018	22
2019	1
2020	6
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)

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Box Elder County, 2001-2021

Year	Number of Person-days
Record Count: 21
2001	780,516
2002	1,189,026
2003	712,768
2004	44,666
2005	856,710
2006	643,272
2007	802,281
2008	435,933
2009	49,372
2010	150,510
2011	0
2012	702,814
2013	202,916
2014	102,606
2015	103,664
2016	0
2017	161,901
2018	274,750
2019	0
2020	171,021
2021	236,880

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Cache County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	1,010,471
2001	185,662
2002	381,972
2003	679,707
2004	0
2005	301,503
2006	404,944
2007	932,616
2008	213,648
2009	0
2010	0
2011	0
2012	579,485
2013	117,031
2014	0
2015	239,548
2016	0
2017	0
2018	254,136
2019	0
2020	260,008
2021	137,255

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Carbon County, 2011-2021

Year	Number of Person-days
Record Count: 11
2011	21,303
2012	169,768
2013	41,802
2014	0
2015	40,770
2016	0
2017	0
2018	101,345
2019	20,463
2020	0
2021	81,952

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for ozone. Data are not available prior to 2011 because 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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Davis County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	5,048,862
2001	4,159,679
2002	5,492,872
2003	3,578,148
2004	262,189
2005	6,999,408
2006	4,182,000
2007	4,035,304
2008	4,437,015
2009	1,509,825
2010	1,539,530
2011	623,676
2012	0
2013	0
2014	2,301,292
2015	1,338,704
2016	2,728,640
2017	7,284,501
2018	3,868,843
2019	1,777,405
2020	3,592,320
2021	7,726,824

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Duchesne County, 2011-2021

Year	Number of Person-days
Record Count: 11
2011	430,123
2012	95,020
2013	858,495
2014	40,412
2015	41,512
2016	162,040
2017	179,235
2018	159,712
2019	239,256
2020	19,894
2021	98,690

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Product of the total population of the county and the number of days over the daily National Ambient Air Quality Standard for ozone. Data are not available prior to 2011 because 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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Garfield County, 2011-2021

Year	Number of Person-days
Record Count: 11
2011	0
2012	10,126
2013	10,058
2014	0
2015	9,938
2016	**
2017	10,122
2018	10,160
2019	0
2020	0
2021	10,158

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] ^ ^**The estimate has been suppressed because 1) the relative standard error is greater than 50% or 2) the observed number of events is very small and not appropriate for publication. Product of the total population of the county (estimate) and the number of days over the daily National Ambient Air Quality Standard for ozone. Data are not available prior to 2011 because 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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Iron County, 2018-2021

Year	Number of Person-days
Record Count: 4
2018	0
2019	0
2020	0
2021	122,464

Data Notes

Data Source

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Salt Lake County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	27,030,540
2001	23,679,500
2002	29,380,864
2003	26,819,258
2004	14,012,100
2005	25,595,001
2006	38,671,920
2007	39,348,760
2008	17,991,954
2009	14,235,130
2010	6,197,874
2011	14,665,798
2012	17,024,336
2013	12,954,516
2014	6,541,542
2015	23,155,209
2016	14,568,892
2017	36,410,240
2018	43,800,054
2019	13,925,244
2020	17,482,755
2021	46,704,489

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, San Juan County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	143,340
2001	0
2002	95,634
2003	108,568
2004	68,615
2005	40,959
2006	13,679
2007	84,168
2008	43,308
2009	29,028
2010	29,650
2011	44,508
2012	60,136
2013	0
2014	0
2015	15,240
2016	0
2017	0
2018	108,143
2019	0
2020	30,556
2021	29,294

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Tooele County, 2005-2021

Year	Number of Person-days
Record Count: 17
2005	492,580
2006	617,796
2007	592,031
2008	167,727
2009	114,436
2010	234,004
2011	236,728
2012	418,516
2013	242,532
2014	61,446
2015	250,468
2016	322,675
2017	1,146,106
2018	419,442
2019	72,259
2020	149,024
2021	685,404

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Product of the total population of the county and the number of days over the daily National Ambient Air Quality Standard for ozone. Data are not available prior to 2005 because 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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Uintah County, 2007-2021

Year	Number of Person-days
Record Count: 15
2007	0
2008	0
2009	65,862
2010	1,526,043
2011	1,030,471
2012	415,692
2013	2,140,980
2014	295,368
2015	75,566
2016	398,794
2017	387,409
2018	354,380
2019	607,478
2020	71,940
2021	287,800

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Product of the total population of the county and the number of days over the daily National Ambient Air Quality Standard for ozone. Data are not available prior to 2007 because 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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Utah County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	8,551,653
2001	7,327,749
2002	9,135,370
2003	11,778,582
2004	1,248,660
2005	5,599,061
2006	12,103,992
2007	7,513,184
2008	5,363,765
2009	1,514,403
2010	3,639,958
2011	0
2012	6,476,448
2013	4,961,997
2014	4,486,008
2015	5,153,850
2016	4,130,574
2017	4,852,024
2018	13,688,686
2019	0
2020	1,953,177
2021	9,570,750

Data Notes

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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Washington County, 2004-2021

Year	Number of Person-days
Record Count: 18
2004	1,212,277
2005	2,142,000
2006	887,572
2007	529,108
2008	813,312
2009	411,264
2010	1,107,136
2011	706,225
2012	1,729,752
2013	294,008
2014	151,109
2015	464,040
2016	0
2017	165,859
2018	171,700
2019	0
2020	554,739
2021	378,864

Data Notes

These data include "exceptional events", such as high winds, fires, construction, fireworks, etc. [[br]] [[br]] Product of the total population of the county and the number of days over the daily National Ambient Air Quality Standard for ozone. Data are not available prior to 2004 because 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

Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Weber County, 2000-2021

Year	Number of Person-days
Record Count: 22
2000	3,948,740
2001	3,401,241
2002	4,873,080
2003	5,132,975
2004	831,176
2005	4,623,300
2006	5,954,368
2007	6,091,876
2008	2,907,788
2009	912,472
2010	1,392,834
2011	2,572,152
2012	4,725,280
2013	1,666,651
2014	960,848
2015	1,943,704
2016	2,225,277
2017	4,029,856
2018	4,101,744
2019	260,213
2020	1,575,948
2021	2,656,350

Data Notes

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

References and Community Resources

Utah Environmental Epidemiology Program[[br]] Air Pollution and Public Health in Utah[[br]] [http://www.health.utah.gov/utahair/pollutants/O3/][[br]] [[br]] AirNow[[br]] This U.S. Government website provides information on air quality from a collaboration of different agencies.[[br]] [http://airnow.gov][[br]] [[br]] Centers for Disease Control and Prevention[[br]] This CDC website provides information about the way air quality influences health outcomes.[[br]] [http://ephtracking.cdc.gov/showAirLanding][[br]] [[br]] Choose Clean Air[[br]] This DEQ website provides tips and trends regarding healthy choices and pollution levels.[[br]] [https://air.utah.gov/][[br]] [[br]] Environmental Protection Agency[[br]] This website provides information about ozone, adverse health effects, research, and regulations.[[br]] [https://cfpub.epa.gov/airnow/index.cfm?action=gooduphigh.index][[br]] [[br]] Three-day Air Quality Forecast[[br]] This site provides the three-day forecast as well as publications about Utah's compliance with the EPA's new ozone standard.[[br]] [https://air.utah.gov/forecast.php][[br]]

Public Data

Secure Data

My EPHT

Complete Health Indicator Report of Air Quality: Ozone

Definition

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Graphical Data Views

Maximum 8-hour average ozone concentrations above the National Ambient Air Quality Standard (NAAQS), Number of days by county, Utah, 2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Box Elder County, 2001-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Cache County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Carbon County, 2011-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Davis County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Duchesne County, 2011-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Garfield County, 2011-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Iron County, 2018-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Salt Lake County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, San Juan County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Tooele County, 2005-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Uintah County, 2007-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Utah County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Washington County, 2004-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Days by Year, Weber County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Box Elder County, 2001-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Cache County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Carbon County, 2011-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Davis County, 2000-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Duchesne County, 2011-2021

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Maximum 8-hour Average Ozone Concentrations Above the National Ambient Air Quality Standards (NAAQS), Number of Person-days by Year, Garfield County, 2011-2021

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