With wildfire smoke filling the summer skies in recent years on top of the perennial winter inversions trap pollution in populated valleys, it would seem air quality has worsened in the past decade.

Or has it?

The federal Environmental Protection Agency said concentrations of air pollutants have dropped “significantly” since 1990. And over the past decade in the Intermountain West, days rated as variants of “unhealthy” in the EPA’s Air Quality Index dropped to new lows in 2019, a Deseret News analysis found.

The Deseret News arrived at statewide numbers by adding together days designated as “unhealthy for sensitive groups,” “unhealthy” and “very unhealthy” in each county, then averaging those totals within each state. The average number of total unhealthy days across Arizona, Colorado, Idaho, New Mexico, Nevada, Utah and Wyoming in 2020 was less than it was in 2010.

“The Air Quality Index tells you how clean or polluted your outdoor air is, along with associated health effects that may be of concern,”  EPA spokesperson Melissa Sullivan said in an email. “Millions of people live in areas where air pollution can cause serious health problems.”

Overall, Arizona had the worst air quality of any state in the Intermountain West with the average of unhealthy days per year reaching nearly 20, double that of second place Utah.

And that ranking comes without data from Maricopa County, Arizona’s most populated area, which was excluded from the past decade’s data because the EPA said the results “are not reliable” due to “anomalous, elevated ozone concentrations from one monitor.”

“We are working with the reporting agency to resolve the issue,” Sullivan said.

Although air quality data goes through a quality assurance procedure, it isn’t always reliable because of delays in reporting, state data gathering and reporting methods, faulty monitors or other anomalies.

“Like all tools, the AQI is only as good as the data used to drive it,” Sullivan said. “It is the best tool available to communicate air quality levels to the general public and has been used for over 20 years. Because of its reliability it has been adopted and imitated worldwide.”

Regarding methods varying by state, some do not consistently report data for all counties and might not track all pollutants.

“States choose to site monitors in areas with higher concentrations and/or higher population since the minimum monitoring requirements are based on population size,” Sullivan said. “Therefore, not all counties have monitors from one year to the next (and those that do have monitors do not necessarily measure every pollutant).”

There’s a noticeable dip in average unhealthy days across the Intermountain West in 2019, something the EPA attributes to fewer wildfires.

“The air quality, specifically particulate matter pollution, in most (if not all) of those states was impacted by high wildfire activity in 2017 and 2018, and again in 2020,” Sullivan said.

And in 2013, Utah had an uptick in average total unhealthy days, something that the EPA can’t explain.

“Unfortunately, we do not have information regarding a 2013 uptick in Utah,” Sullivan said.

As far as the good days over the past decade: In 2010, Clear Creek County, Colorado, only had four “good” days reported. But in 2012, Taos County, New Mexico, had all 365 days classified as “good.” 

In 2011, Pima County, Arizona, had 22 “very unhealthy” days — the most out of any county in the Intermountain West during the past decade. 

Last year, three counties in Idaho — Kootenai, Nez Perce and Shoshone — had the most “very unhealthy” days with four days each.

According to the EPA, “very few locations (about 0.3% of counties) have any days in the very unhealthy or hazardous categories.”

Wyoming consistently has the least “unhealthy” days around the region with little average variance over the decade.

Check the EPA data on how the air quality in your county has been changing:

Air quality by state and county, 2010-20

YearStateCountyGoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyUnhealthy total
2020AZApache County36040000
2020AZCochise County274902002
2020AZCoconino County308580000
2020AZGila County233119113014
2020AZLa Paz County294702002
2020AZMohave County34781001
2020AZNavajo County317472002
2020AZPima County154199120113
2020AZPinal County97186765283
2020AZSanta Cruz County2331224105
2020AZYavapai County265651001
2020AZYuma County2571062013
2020COAdams County222132111012
2020COAlamosa County9630000
2020COArapahoe County24810792011
2020COArchuleta County302630000
2020COBoulder County217128192021
2020COClear Creek County134506006
2020CODelta County328370000
2020CODenver County185164170017
2020CODouglas County237107143017
2020COEl Paso County2551046107
2020COFremont County1700000
2020COGarfield County2551065005
2020COGilpin County278709009
2020COGunnison County278532002
2020COJackson County6140000
2020COJefferson County231108234027
2020COLa Plata County287781001
2020COLarimer County222125172019
2020COMesa County302613003
2020COMontezuma County301632002
2020COPitkin County11240000
2020COProwers County327191214
2020COPueblo County9150000
2020CORio Blanco County311513003
2020CORoutt County35350000
2020COSan Juan County9720000
2020COSan Miguel County11430000
2020COWeld County219134130013
2020IDAda County27375117018
2020IDBannock County281783407
2020IDBenewah County272852439
2020IDBlaine County335226208
2020IDBoise County2678766012
2020IDBonner County3253055010
2020IDBonneville County326311405
2020IDButte County334281102
2020IDCanyon County25793106016
2020IDCaribou County34151001
2020IDCuster County8873003
2020IDFranklin County323392103
2020IDIdaho County293643609
2020IDJerome County21300000
2020IDKootenai County323231348
2020IDLatah County335190437
2020IDLemhi County22612883011
2020IDNez Perce County3094643411
2020IDShoshone County275840347
2020IDTwin Falls County330273407
2020IDValley County248745207
2020NMBernalillo County1352227119
2020NMCatron County9140000
2020NMChaves County9630000
2020NMDona Ana County168177153321
2020NMEddy County248105110011
2020NMLea County334320000
2020NMLincoln County9610000
2020NMLos Alamos County10010000
2020NMLuna County335180011
2020NMRio Arriba County314480000
2020NMSandoval County271825005
2020NMSan Juan County265965005
2020NMSanta Fe County297681001
2020NMSocorro County9100000
2020NMTaos County337230000
2020NMValencia County283742002
2020NVChurchill County336252002
2020NVClark County108233223025
2020NVDouglas County3113869217
2020NVElko County333281102
2020NVLyon County308395319
2020NVNye County343201203
2020NVWashoe County2391031111224
2020NVWhite Pine County294643003
2020NVCarson City30244128020
2020UTBox Elder County316363003
2020UTCache County2521055409
2020UTCarbon County308420000
2020UTDavis County242110131014
2020UTDuchesne County266955005
2020UTGarfield County332330000
2020UTIron County332340000
2020UTSalt Lake County192154182020
2020UTSan Juan County306442002
2020UTTooele County278834105
2020UTUintah County2551083003
2020UTUtah County2371245005
2020UTWashington County292713003
2020UTWayne County9530000
2020UTWeber County2581026006
2020WYAlbany County2531047209
2020WYBig Horn County34982002
2020WYCampbell County2471163003
2020WYCarbon County36420000
2020WYConverse County304584004
2020WYFremont County288725106
2020WYJohnson County337270000
2020WYLaramie County322393205
2020WYLincoln County35790000
2020WYNatrona County321414004
2020WYPark County11552002
2020WYPlatte County202201012
2020WYSheridan County344220000
2020WYSublette County297644105
2020WYSweetwater County23811674112
2020WYTeton County3183675012
2020WYUinta County323412002
2020WYWeston County336291001
2019AZApache County35810000
2019AZCochise County266990000
2019AZCoconino County289760000
2019AZGila County145164506056
2019AZLa Paz County304600000
2019AZMohave County35870000
2019AZNavajo County294701001
2019AZPima County2251382002
2019AZPinal County1232092121033
2019AZSanta Cruz County280802002
2019AZYavapai County299580000
2019AZYuma County265973003
2019COAdams County2231411001
2019COAlamosa County10700000
2019COArapahoe County2271326006
2019COArchuleta County331302002
2019COBoulder County2271335005
2019COClear Creek County205841001
2019CODelta County339260000
2019CODenver County1791832103
2019CODouglas County236114101011
2019COEl Paso County2591060000
2019COFremont County3200000
2019COGarfield County309560000
2019COGilpin County117251001
2019COGunnison County279781001
2019COJackson County10200000
2019COJefferson County238111160016
2019COLa Plata County276890000
2019COLarimer County2081516006
2019COMesa County289750000
2019COMontezuma County279860000
2019COPitkin County12100000
2019COProwers County34330000
2019COPueblo County12510000
2019CORio Blanco County311540000
2019CORoutt County35321001
2019COSan Juan County11600000
2019COSan Miguel County11210000
2019COWeld County2521103003
2019IDAda County317480000
2019IDBannock County344210000
2019IDBenewah County24211192011
2019IDBlaine County31310000
2019IDBoise County290722103
2019IDBonner County316481001
2019IDBonneville County342150000
2019IDButte County348130000
2019IDCanyon County311540000
2019IDCaribou County32622002
2019IDCuster County9600000
2019IDFranklin County333283003
2019IDIdaho County297680000
2019IDJerome County35300000
2019IDKootenai County318370000
2019IDLatah County35000000
2019IDLemhi County269874004
2019IDNez Perce County309510000
2019IDShoshone County2601023003
2019IDTwin Falls County36140000
2019IDValley County290670000
2019NMBernalillo County1641974004
2019NMCatron County11100000
2019NMChaves County11710000
2019NMDona Ana County170171173424
2019NMEddy County212134172019
2019NMLea County2521094004
2019NMLincoln County10700000
2019NMLos Alamos County11700000
2019NMLuna County349101012
2019NMRio Arriba County315430000
2019NMSandoval County276870000
2019NMSan Juan County2081570000
2019NMSanta Fe County274871001
2019NMSocorro County9200000
2019NMTaos County334240000
2019NMValencia County270870000
2019NVChurchill County323300000
2019NVClark County1542065005
2019NVDouglas County346100000
2019NVElko County36320000
2019NVLyon County344120000
2019NVNye County352121001
2019NVWashoe County2441210000
2019NVWhite Pine County294671001
2019NVCarson City308570000
2019UTBox Elder County313492002
2019UTCache County27279140014
2019UTCarbon County265991001
2019UTDavis County265946006
2019UTDuchesne County23412074011
2019UTGarfield County258410000
2019UTIron County329360000
2019UTSalt Lake County172177160016
2019UTSan Juan County299630000
2019UTTooele County302612002
2019UTUintah County223125124117
2019UTUtah County2531111001
2019UTWashington County291740000
2019UTWayne County10900000
2019UTWeber County243632002
2019WYAlbany County2471180000
2019WYBig Horn County344120000
2019WYCampbell County309551001
2019WYCarbon County325382002
2019WYConverse County317471001
2019WYFremont County294692002
2019WYJohnson County345190000
2019WYLaramie County305600000
2019WYLincoln County36410000
2019WYNatrona County327370000
2019WYPark County295120000
2019WYPlatte County5631001
2019WYSheridan County325400000
2019WYSublette County2668883011
2019WYSweetwater County2621003003
2019WYTeton County326390000
2019WYUinta County315491001
2019WYWeston County340250000
2018AZApache County35440000
2018AZCochise County276890000
2018AZCoconino County2401223003
2018AZGila County107170808088
2018AZLa Paz County263983003
2018AZMohave County350121001
2018AZNavajo County2611002002
2018AZPima County196158110011
2018AZPinal County852293461151
2018AZSanta Cruz County294691102
2018AZYavapai County292721001
2018AZYuma County239110151016
2018COAdams County1991633003
2018COAlamosa County35180011
2018COArapahoe County231119141015
2018COArchuleta County333320000
2018COBoulder County219114281029
2018COChaffee County67915106
2018COClear Creek County145118253028
2018CODelta County277200000
2018CODenver County177178100010
2018CODouglas County215122243027
2018COEl Paso County2331248008
2018COFremont County2000000
2018COGarfield County217132151016
2018COGrand County110541102
2018COGunnison County2351254105
2018COJackson County11330000
2018COJefferson County22999352037
2018COLa Plata County240105109120
2018COLarimer County195142253028
2018COMesa County2161445005
2018COMoffat County262681001
2018COMontezuma County259964004
2018COMontrose County257681001
2018COPark County161145171018
2018COPitkin County12300000
2018COProwers County35351001
2018COPueblo County11751001
2018CORio Blanco County2421212002
2018CORoutt County35410000
2018COSan Juan County11350000
2018COSan Miguel County160762002
2018COTeller County6385120012
2018COWeld County187168100010
2018IDAda County283757007
2018IDBannock County305562204
2018IDBenewah County219129112013
2018IDBlaine County327333003
2018IDBoise County2371226006
2018IDBonner County30839114116
2018IDBonneville County306432103
2018IDButte County313473003
2018IDCanyon County283775005
2018IDCaribou County36210000
2018IDCuster County8532002
2018IDFranklin County278383003
2018IDIdaho County297662002
2018IDJerome County287285005
2018IDKootenai County2724954110
2018IDLatah County339205106
2018IDLemhi County260973003
2018IDNez Perce County308524105
2018IDShoshone County217135121013
2018IDTwin Falls County313373205
2018IDValley County297542002
2018NMBernalillo County160186181019
2018NMCatron County11700000
2018NMChaves County11530000
2018NMDona Ana County144189284032
2018NMEddy County214131173020
2018NMLea County2271326006
2018NMLincoln County11510000
2018NMLos Alamos County12000000
2018NMLuna County343113003
2018NMRio Arriba County2461133003
2018NMSandoval County224118120012
2018NMSan Juan County213136160016
2018NMSanta Fe County279833003
2018NMSocorro County11020000
2018NMTaos County346190000
2018NMValencia County2381165005
2018NVChurchill County256715005
2018NVClark County122194481049
2018NVDouglas County3153763110
2018NVElko County297454004
2018NVLyon County304508008
2018NVNye County350150000
2018NVWashoe County213133190019
2018NVWhite Pine County261886006
2018NVCarson City269885308
2018UTBox Elder County2251318109
2018UTCache County2351237007
2018UTCarbon County2311285005
2018UTDavis County216136121013
2018UTDuchesne County221133110011
2018UTGarfield County2601032002
2018UTIron County2591060000
2018UTSalt Lake County146178392041
2018UTSan Juan County2451047007
2018UTTooele County222133100010
2018UTUintah County189165101011
2018UTUtah County218115257032
2018UTWashington County2281361001
2018UTWayne County11430000
2018UTWeber County203145152017
2018WYAlbany County2231393003
2018WYBig Horn County311370000
2018WYCampbell County266952204
2018WYCarbon County291740000
2018WYConverse County311531001
2018WYFremont County2521112002
2018WYJohnson County190380000
2018WYLaramie County295691001
2018WYLincoln County343220000
2018WYNatrona County289760000
2018WYPark County20192002
2018WYPlatte County5830000
2018WYSheridan County2601023003
2018WYSublette County2331320000
2018WYSweetwater County2071498109
2018WYTeton County286781001
2018WYUinta County287771001
2018WYWeston County316481001
2017AZApache County36320000
2017AZCochise County2551082002
2017AZCoconino County2591051001
2017AZGila County69155120210141
2017AZLa Paz County279802002
2017AZMohave County34960000
2017AZNavajo County279851001
2017AZPima County1452137007
2017AZPinal County64233597268
2017AZSanta Cruz County276852204
2017AZYavapai County2311045005
2017AZYuma County241110121114
2017COAdams County2061572002
2017COAlamosa County35220000
2017COArapahoe County2241347007
2017COArchuleta County311490000
2017COBoulder County240106110011
2017COChaffee County14400000
2017COClear Creek County1731374004
2017CODelta County11410000
2017CODenver County1831802002
2017CODouglas County206140161017
2017COEl Paso County2391233003
2017COFremont County3900000
2017COGarfield County2411231001
2017COGrand County10980000
2017COGunnison County275871001
2017COJackson County11511001
2017COJefferson County214123280028
2017COLa Plata County2601014004
2017COLarimer County194158121013
2017COMesa County2381261001
2017COMoffat County282670000
2017COMontezuma County284801001
2017COMontrose County313300000
2017COPark County2391224004
2017COPitkin County12300000
2017COProwers County34760000
2017COPueblo County12032002
2017CORio Blanco County276890000
2017CORoutt County33390000
2017COSan Juan County11900000
2017COSan Miguel County197320000
2017COWeld County2111467108
2017IDAda County234109184022
2017IDBannock County271873407
2017IDBenewah County206129208230
2017IDBlaine County203124105
2017IDBoise County2728362210
2017IDBonner County2876370512
2017IDBonneville County323314004
2017IDButte County309353003
2017IDCanyon County26088134017
2017IDCaribou County33720000
2017IDCuster County10263003
2017IDFranklin County2945795014
2017IDIdaho County2876186317
2017IDJerome County255265106
2017IDKootenai County3004461411
2017IDLatah County3211854211
2017IDLemhi County24285238031
2017IDNez Perce County2876366315
2017IDShoshone County220120193325
2017IDTwin Falls County220625106
2017IDValley County2737766012
2017NMBernalillo County1701914004
2017NMCatron County11022002
2017NMChaves County11531001
2017NMDona Ana County131200274334
2017NMEddy County245110100010
2017NMLea County2431184004
2017NMLincoln County11010000
2017NMLos Alamos County11600000
2017NMLuna County340155005
2017NMRio Arriba County269883003
2017NMSandoval County269941001
2017NMSan Juan County2301296006
2017NMSanta Fe County285800000
2017NMSocorro County11610000
2017NMTaos County34480000
2017NMValencia County262981001
2017NVChurchill County283643003
2017NVClark County136200281029
2017NVDouglas County296383104
2017NVElko County332280101
2017NVLyon County307533003
2017NVNye County346153104
2017NVWashoe County2021594004
2017NVWhite Pine County290660000
2017NVCarson City278851102
2017UTBox Elder County231123101011
2017UTCache County25494134017
2017UTCarbon County2621020000
2017UTDavis County195142280028
2017UTDuchesne County278786309
2017UTGarfield County176622002
2017UTSalt Lake County149172431044
2017UTSan Juan County263880000
2017UTTooele County237111170017
2017UTUintah County20814636211
2017UTUtah County183168113014
2017UTWashington County2611031001
2017UTWayne County11020000
2017UTWeber County194148212023
2017WYAlbany County2251372103
2017WYBig Horn County326190000
2017WYCampbell County2401184307
2017WYCarbon County309551001
2017WYConverse County290723003
2017WYFremont County2331293003
2017WYLaramie County281811203
2017WYLincoln County348160011
2017WYNatrona County297662002
2017WYPark County107140000
2017WYPlatte County5460000
2017WYSheridan County2591023104
2017WYSublette County2281298008
2017WYSweetwater County2591003216
2017WYTeton County299651001
2017WYUinta County310531012
2017WYWeston County333320000
2016AZApache County36420000
2016AZCochise County281832002
2016AZCoconino County301650000
2016AZGila County84136119270146
2016AZLa Paz County294701001
2016AZMohave County336210000
2016AZNavajo County301650000
2016AZPima County2031594004
2016AZPinal County76237465253
2016AZSanta Cruz County2601020101
2016AZYavapai County300490000
2016AZYuma County228124121114
2016COAdams County2631021001
2016COAlamosa County35441012
2016COArapahoe County267936006
2016COArchuleta County34340000
2016COBoulder County190140000
2016COChaffee County97513003
2016COClear Creek County210946107
2016CODelta County11720000
2016CODenver County1651974004
2016CODouglas County25393151016
2016COEl Paso County2631012002
2016COFremont County5200000
2016COGarfield County2641011001
2016COGrand County131210000
2016COGunnison County316500000
2016COJackson County11500000
2016COJefferson County245101173020
2016COLa Plata County2511078008
2016COLarimer County1891697108
2016COMesa County2601051001
2016COMoffat County316290000
2016COMontezuma County286800000
2016COMontrose County236170000
2016COPark County270933003
2016COPitkin County12200000
2016COProwers County35061001
2016COPueblo County12620000
2016CORio Blanco County327390000
2016CORoutt County34390000
2016COSan Juan County12100000
2016COSan Miguel County189551001
2016COWeld County2461173003
2016IDAda County283767007
2016IDBannock County317490000
2016IDBenewah County2571017108
2016IDBlaine County98150000
2016IDBoise County309485106
2016IDBonner County337290000
2016IDBonneville County301230000
2016IDButte County347141001
2016IDCanyon County2561064004
2016IDCaribou County35520000
2016IDCuster County10483104
2016IDFranklin County306447007
2016IDIdaho County319470000
2016IDJerome County19900000
2016IDKootenai County325260000
2016IDLatah County26820000
2016IDLemhi County230105263029
2016IDNez Perce County328362002
2016IDShoshone County2451165005
2016IDTwin Falls County34840000
2016IDValley County327210000
2016NMBernalillo County1931703003
2016NMCatron County10530000
2016NMChaves County11610000
2016NMDona Ana County154197122115
2016NMEddy County292700000
2016NMLea County312520000
2016NMLincoln County11120000
2016NMLos Alamos County11900000
2016NMLuna County338191203
2016NMRio Arriba County304580000
2016NMSandoval County292690000
2016NMSan Juan County273912002
2016NMSanta Fe County301650000
2016NMSocorro County10110000
2016NMTaos County36020000
2016NMValencia County280820000
2016NVChurchill County284661001
2016NVClark County125215250126
2016NVDouglas County300351001
2016NVElko County34041001
2016NVLyon County282691001
2016NVNye County349151012
2016NVWashoe County2341257007
2016NVWhite Pine County300610000
2016NVCarson City303630000
2016UTBox Elder County285774004
2016UTCache County285738008
2016UTCarbon County230820000
2016UTDavis County26587140014
2016UTDuchesne County275835308
2016UTGarfield County9600000
2016UTSalt Lake County189150234027
2016UTSan Juan County309560000
2016UTTooele County279806107
2016UTUintah County24910645211
2016UTUtah County223124172019
2016UTWashington County286800000
2016UTWayne County12000000
2016UTWeber County233113200020
2016WYAlbany County2661000000
2016WYBig Horn County27760000
2016WYCampbell County2621031001
2016WYCarbon County335310000
2016WYConverse County312530101
2016WYFremont County305610000
2016WYGoshen County293600000
2016WYLaramie County315510000
2016WYLincoln County36330000
2016WYNatrona County333330000
2016WYPark County11830000
2016WYPlatte County5070000
2016WYSheridan County333321001
2016WYSublette County297681001
2016WYSweetwater County303621001
2016WYTeton County331350000
2016WYUinta County341250000
2016WYWeston County325410000
2015AZApache County36100000
2015AZCochise County282830000
2015AZCoconino County2601014004
2015AZGila County8315598290127
2015AZLa Paz County273843003
2015AZMohave County354100000
2015AZNavajo County317480000
2015AZPima County2471171001
2015AZPinal County1052143331046
2015AZSanta Cruz County294683003
2015AZYavapai County235650000
2015AZYuma County26091130114
2015COAdams County271913003
2015COAlamosa County35770000
2015COArapahoe County260992002
2015COArchuleta County34260000
2015COBoulder County265937007
2015COChaffee County65341001
2015COClear Creek County1821076006
2015CODelta County11310000
2015CODenver County1661909009
2015CODouglas County25110092011
2015COEl Paso County272912002
2015COFremont County5700000
2015COGarfield County26590100010
2015COGrand County5950000
2015COGunnison County283793003
2015COJackson County347160000
2015COJefferson County244104152017
2015COLa Plata County271922002
2015COLarimer County198150161017
2015COMesa County2531093003
2015COMoffat County13740000
2015COMontezuma County284810000
2015COPark County266804004
2015COPitkin County12220000
2015COProwers County33991023
2015COPueblo County12360000
2015CORio Blanco County302630000
2015CORoutt County35770000
2015COSan Juan County12100000
2015COSan Miguel County188471001
2015COWeld County2321249009
2015IDAda County294627209
2015IDBannock County320385207
2015IDBenewah County201141185023
2015IDBlaine County19732002
2015IDBoise County227435005
2015IDBonner County3163793012
2015IDBonneville County9860000
2015IDButte County325340101
2015IDCanyon County3134182010
2015IDCaribou County35600000
2015IDCuster County11520000
2015IDFranklin County296344105
2015IDIdaho County228332338
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K. Sophie Will is a Deseret News contributor. @ksophiewill