SmogRank / Countries / United States / May 2025
Most polluted cities in United States, May 2025
644 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Sunland Park at 17.8 µg/m³, #192 of 2,193 cities in the world. Cleanest: Inglewood-Finn Hill at 1.6. A city needs measurements on 70% of the days to be ranked.
- 1Sunland ParkNew Mexico 17.8
- 2Santa Monicalow-cost sensorsCalifornia 16.4
- 3EdinburgTexas 15.9
- 4El PasoTexas 15.5
- 5LaredoTexas 15.4
- 6BrownsvilleTexas 14.6
- 6SocorroTexas 14.6
- 8MissionTexas 14.3
- 9Pasadenalow-cost sensorsCalifornia 13.6
- 10Los AngelesCalifornia 13.4
- 11PaysonArizona 13.0
- 12Corpus ChristiTexas 12.9
- 13NipomoCalifornia 12.7
- 14Eagle PassTexas 12.6
- 15HoustonTexas 12.1
- 15CalexicoCalifornia 12.1
- 17San AntonioTexas 11.9
- 18Santa BarbaraCalifornia 11.8
- 19FontanaCalifornia 11.7
- 20Arroyo GrandeCalifornia 11.4
- 21Jurupa ValleyCalifornia 11.3
- 22BurbankCalifornia 11.1
- 23Live OakTexas 11.0
- 23BrookingsSouth Dakota 11.0
- 25RiversideCalifornia 10.8
- 25Santa ClaritaCalifornia 10.8
- 25Las CrucesNew Mexico 10.8
- 28AustinTexas 10.7
- 28San MarcosTexas 10.7
- 28ComptonCalifornia 10.7
- 31Wake Forestlow-cost sensorsNorth Carolina 10.6
- 31ConroeTexas 10.6
- 31PasadenaTexas 10.6
- 34Mission BendTexas 10.5
- 35BaytownTexas 10.3
- 36San DiegoCalifornia 10.1
- 37AnaheimCalifornia 10.0
- 37BerkeleyCalifornia 10.0
- 37GlendoraCalifornia 10.0
- 40WyomingMichigan 9.9
- 40BakersfieldCalifornia 9.9
- 40OdessaTexas 9.9
- 43BeltonTexas 9.8
- 44LompocCalifornia 9.5
- 44PowayCalifornia 9.5
- 44Simi ValleyCalifornia 9.5
- 44HobbsNew Mexico 9.5
- 48Missouri CityTexas 9.4
- 48WatertownSouth Dakota 9.4
- 50TexarkanaTexas 9.3
- 50El CajonCalifornia 9.3
- 50OxnardCalifornia 9.3
- 53MaconGeorgia 9.2
- 53College StationTexas 9.2
- 53Fort WorthTexas 9.2
- 53PortervilleCalifornia 9.2
- 57OaklandCalifornia 9.1
- 57HelenaMontana 9.1
- 59VeniceFlorida 9.0
- 59VictorvilleCalifornia 9.0
- 59MillcreekUtah 9.0
- 62BismarckNorth Dakota 8.9
- 63ValdostaGeorgia 8.7
- 63GalvestonTexas 8.7
- 63GaryIndiana 8.7
- 63IndioCalifornia 8.7
- 67SpringdaleArkansas 8.6
- 67North CharlestonSouth Carolina 8.6
- 67TemeculaCalifornia 8.6
- 67Thousand OaksCalifornia 8.6
- 67Great FallsMontana 8.6
- 72Ponte Vedra BeachFlorida 8.4
- 72OceansideCalifornia 8.4
- 74Bonita SpringsFlorida 8.3
- 74TallahasseeFlorida 8.3
- 74AugustaGeorgia 8.3
- 74CorsicanaTexas 8.3
- 74SaginawTexas 8.3
- 74RedfordMichigan 8.3
- 74BanningCalifornia 8.3
- 74VisaliaCalifornia 8.3
- 82AlbanyGeorgia 8.2
- 82SavannahGeorgia 8.2
- 82FlorenceSouth Carolina 8.2
- 82NogalesArizona 8.2
- 82SalinasCalifornia 8.2
- 82WoodlandCalifornia 8.2
- 88BirminghamAlabama 8.1
- 88Oak RidgeFlorida 8.1
- 88SewellNew Jersey 8.1
- 88Oklahoma CityOklahoma 8.1
- 88Santa PaulaCalifornia 8.1
- 93Saint JosephMissouri 8.0
- 93Casa GrandeArizona 8.0
- 93HanfordCalifornia 8.0
- 93AnacortesWashington 8.0
- 97Port ArthurTexas 7.9
- 97CorcoranCalifornia 7.9
- 97Long BeachCalifornia 7.9
- 97San FranciscoCalifornia 7.9
- 97San JoseCalifornia 7.9
- 102ValricoFlorida 7.8
- 102Terre HauteIndiana 7.8
- 102Des MoinesIowa 7.8
- 102WaterlooIowa 7.8
- 102OremUtah 7.8
- 107Warner RobinsGeorgia 7.7
- 107DentonTexas 7.7
- 107Lake ElsinoreCalifornia 7.7
- 107StocktonCalifornia 7.7
- 111HammondIndiana 7.6
- 111West FargoNorth Dakota 7.6
- 113TampaFlorida 7.5
- 113GainesvilleGeorgia 7.5
- 113IndianapolisIndiana 7.5
- 113Columbialow-cost sensorsMissouri 7.5
- 113FayettevilleNorth Carolina 7.5
- 113MiddletownOhio 7.5
- 113FresnoCalifornia 7.5
- 113South Lake TahoeCalifornia 7.5
- 113VallejoCalifornia 7.5
- 122Baton RougeLouisiana 7.4
- 122DurhamNorth Carolina 7.4
- 124GadsdenAlabama 7.3
- 124OrlandoFlorida 7.3
- 124Palm CityFlorida 7.3
- 124Valley StationKentucky 7.3
- 124LafayetteLouisiana 7.3
- 124ColumbusOhio 7.3
- 124Saint AndrewsSouth Carolina 7.3
- 124SpartanburgSouth Carolina 7.3
- 124BridgeviewIllinois 7.3
- 124ElizabethNew Jersey 7.3
- 124Four CornersFlorida 7.3
- 124Candler-McAfeeGeorgia 7.3
- 136AtlantaGeorgia 7.2
- 136WichitaKansas 7.2
- 136CharlotteNorth Carolina 7.2
- 136TulsaOklahoma 7.2
- 136LafayetteIndiana 7.2
- 136TucsonArizona 7.2
- 136San LeandroCalifornia 7.2
- 136West Valley CityUtah 7.2
- 136MidwayFlorida 7.2
- 145MontgomeryAlabama 7.1
- 145Daytona BeachFlorida 7.1
- 145GainesvilleFlorida 7.1
- 145St. PetersburgFlorida 7.1
- 145McDonoughGeorgia 7.1
- 145DerbyKansas 7.1
- 145Calumet CityIllinois 7.1
- 145NapervilleIllinois 7.1
- 145MinneapolisMinnesota 7.1
- 145FillmoreCalifornia 7.1
- 145YumaArizona 7.1
- 145ChicoCalifornia 7.1
- 145West JordanUtah 7.1
- 158ColumbusGeorgia 7.0
- 158St. LouisMissouri 7.0
- 158HickoryNorth Carolina 7.0
- 158HollandMichigan 7.0
- 158Apple ValleyMinnesota 7.0
- 158BurnsvilleMinnesota 7.0
- 158LindenNew Jersey 7.0
- 158MaderaCalifornia 7.0
- 166Little RockArkansas 6.9
- 166Fort LauderdaleFlorida 6.9
- 166MiamiFlorida 6.9
- 166BrunswickGeorgia 6.9
- 166East ChicagoIndiana 6.9
- 166Fort WayneIndiana 6.9
- 166New York CityNew York 6.9
- 173JacksonvilleFlorida 6.8
- 173MooreOklahoma 6.8
- 173East RidgeTennessee 6.8
- 173MankatoMinnesota 6.8
- 173El CentroCalifornia 6.8
- 173FolsomCalifornia 6.8
- 173HighlandUtah 6.8
- 180HueytownAlabama 6.7
- 180HomesteadFlorida 6.7
- 180JacksonMississippi 6.7
- 180ClaytonNorth Carolina 6.7
- 180CharlottesvilleVirginia 6.7
- 180MuscatineIowa 6.7
- 180JolietIllinois 6.7
- 180ShakopeeMinnesota 6.7
- 180OregonOhio 6.7
- 180San Luis ObispoCalifornia 6.7
- 190East Saint LouisIllinois 6.6
- 190MorrisvilleNorth Carolina 6.6
- 190ConwaySouth Carolina 6.6
- 190ChesapeakeVirginia 6.6
- 190DoltonIllinois 6.6
- 190MartinezCalifornia 6.6
- 190RosevilleCalifornia 6.6
- 190TurlockCalifornia 6.6
- 190Salt Lake CityUtah 6.6
- 199TrussvilleAlabama 6.5
- 199Lake MaryFlorida 6.5
- 199LawrencevilleGeorgia 6.5
- 199FishersIndiana 6.5
- 199OwensboroKentucky 6.5
- 199KennerLouisiana 6.5
- 199SulphurLouisiana 6.5
- 199ArnoldMissouri 6.5
- 199Roanoke RapidsNorth Carolina 6.5
- 199PeoriaIllinois 6.5
- 199ClovisCalifornia 6.5
- 199GaltCalifornia 6.5
- 199RexburgIdaho 6.5
- 199HerrimanUtah 6.5
- 213PrichardAlabama 6.4
- 213Belle GladeFlorida 6.4
- 213EvansvilleIndiana 6.4
- 213GulfportMississippi 6.4
- 213DyersburgTennessee 6.4
- 213AnkenyIowa 6.4
- 213RochesterMinnesota 6.4
- 213PerrysburgOhio 6.4
- 213WestervilleOhio 6.4
- 213Redwood CityCalifornia 6.4
- 213Cedar CityUtah 6.4
- 224Fort MyersFlorida 6.3
- 224SarasotaFlorida 6.3
- 224AthensGeorgia 6.3
- 224Granite CityIllinois 6.3
- 224LemayMissouri 6.3
- 224SpringfieldOhio 6.3
- 224ChattanoogaTennessee 6.3
- 224JacksonTennessee 6.3
- 224East HamptonVirginia 6.3
- 224PortageIndiana 6.3
- 224Saint PaulMinnesota 6.3
- 224CantonOhio 6.3
- 224PhoenixArizona 6.3
- 224GilroyCalifornia 6.3
- 224OrcuttCalifornia 6.3
- 239DavieFlorida 6.2
- 239Fruit CoveFlorida 6.2
- 239Safety HarborFlorida 6.2
- 239WellingtonFlorida 6.2
- 239JeffersonvilleIndiana 6.2
- 239Kansas CityKansas 6.2
- 239LouisvilleKentucky 6.2
- 239ChalmetteLouisiana 6.2
- 239New OrleansLouisiana 6.2
- 239HattiesburgMississippi 6.2
- 239RaleighNorth Carolina 6.2
- 239NorwoodOhio 6.2
- 239Cedar RapidsIowa 6.2
- 239ElginIllinois 6.2
- 239Oak LawnIllinois 6.2
- 239SuperiorWisconsin 6.2
- 239WheelingWest Virginia 6.2
- 239Casas AdobesArizona 6.2
- 239MaranaArizona 6.2
- 239LancasterCalifornia 6.2
- 239Yuba CityCalifornia 6.2
- 260Delray BeachFlorida 6.1
- 260JasperIndiana 6.1
- 260TopekaKansas 6.1
- 260BaltimoreMaryland 6.1
- 260DaytonOhio 6.1
- 260PhiladelphiaPennsylvania 6.1
- 260DavenportIowa 6.1
- 260ChicagoIllinois 6.1
- 260Elmwood ParkIllinois 6.1
- 260Saint MichaelMinnesota 6.1
- 260OmahaNebraska 6.1
- 260DublinOhio 6.1
- 260West MifflinPennsylvania 6.1
- 260HollisterCalifornia 6.1
- 260LivermoreCalifornia 6.1
- 260ThorntonColorado 6.1
- 260AlbuquerqueNew Mexico 6.1
- 260Rapid CitySouth Dakota 6.1
- 260Spanish ForkUtah 6.1
- 279Deerfield BeachFlorida 6.0
- 279HernandoMississippi 6.0
- 279ClemmonsNorth Carolina 6.0
- 279GreenvilleNorth Carolina 6.0
- 279South VinelandNew Jersey 6.0
- 279NashvilleTennessee 6.0
- 279ClintonIowa 6.0
- 279AuroraIllinois 6.0
- 279MuncieIndiana 6.0
- 279DuluthMinnesota 6.0
- 279EwingNew Jersey 6.0
- 279SteubenvilleOhio 6.0
- 279DavisCalifornia 6.0
- 279LewistonIdaho 6.0
- 279BozemanMontana 6.0
- 279MagnaUtah 6.0
- 295DecaturAlabama 5.9
- 295HuntsvilleAlabama 5.9
- 295WashingtonDistrict of Columbia 5.9
- 295East LakeFlorida 5.9
- 295GreensboroNorth Carolina 5.9
- 295ClarksvilleTennessee 5.9
- 295HendersonvilleTennessee 5.9
- 295BloomingtonIllinois 5.9
- 295Michigan CityIndiana 5.9
- 295South BendIndiana 5.9
- 295Fort LeeNew Jersey 5.9
- 295ClevelandOhio 5.9
- 295MesaArizona 5.9
- 295SacramentoCalifornia 5.9
- 295Santa CruzCalifornia 5.9
- 310Upper AltonIllinois 5.8
- 310Kansas CityMissouri 5.8
- 310University CityMissouri 5.8
- 310AshevilleNorth Carolina 5.8
- 310CincinnatiOhio 5.8
- 310New HavenConnecticut 5.8
- 310Iowa CityIowa 5.8
- 310ChampaignIllinois 5.8
- 310Des PlainesIllinois 5.8
- 310AndersonIndiana 5.8
- 310BlaineMinnesota 5.8
- 310BensalemPennsylvania 5.8
- 310AberdeenSouth Dakota 5.8
- 310FlagstaffArizona 5.8
- 310MercedCalifornia 5.8
- 310BountifulUtah 5.8
- 326Ferry PassFlorida 5.7
- 326DecaturIllinois 5.7
- 326SpringfieldMissouri 5.7
- 326Winston-SalemNorth Carolina 5.7
- 326Toms RiverNew Jersey 5.7
- 326BartlettTennessee 5.7
- 326ColumbiaTennessee 5.7
- 326KnoxvilleTennessee 5.7
- 326KalamazooMichigan 5.7
- 326Jersey CityNew Jersey 5.7
- 326MilwaukeeWisconsin 5.7
- 326TempeArizona 5.7
- 326RidgecrestCalifornia 5.7
- 339BloomingtonIndiana 5.6
- 339PascagoulaMississippi 5.6
- 339Atlantic CityNew Jersey 5.6
- 339PennsaukenNew Jersey 5.6
- 339PortsmouthOhio 5.6
- 339LawtonOklahoma 5.6
- 339RichmondVirginia 5.6
- 339MolineIllinois 5.6
- 339Grand RapidsMichigan 5.6
- 339New BrunswickNew Jersey 5.6
- 339PatersonNew Jersey 5.6
- 339Oconomowoclow-cost sensorsWisconsin 5.6
- 339North OgdenUtah 5.6
- 352PaducahKentucky 5.5
- 352OlatheKansas 5.5
- 352ScaggsvilleMaryland 5.5
- 352McAlesterOklahoma 5.5
- 352MaryvilleTennessee 5.5
- 352HuntingtonWest Virginia 5.5
- 352Bay CityMichigan 5.5
- 352DetroitMichigan 5.5
- 352UkiahCalifornia 5.5
- 352MoscowIdaho 5.5
- 352Oxon Hill-GlassmanorMaryland 5.5
- 363SpringfieldIllinois 5.4
- 363ColumbusIndiana 5.4
- 363New AlbanyIndiana 5.4
- 363LeawoodKansas 5.4
- 363JeffersontownKentucky 5.4
- 363Saint MatthewsKentucky 5.4
- 363PleasantvilleNew Jersey 5.4
- 363LebanonOhio 5.4
- 363EdmondOklahoma 5.4
- 363KingsportTennessee 5.4
- 363SpringfieldVirginia 5.4
- 363RockfordIllinois 5.4
- 363BostonMassachusetts 5.4
- 363DearbornMichigan 5.4
- 363Saint CloudMinnesota 5.4
- 363Grand IslandNebraska 5.4
- 363AkronOhio 5.4
- 363ToledoOhio 5.4
- 363LebanonPennsylvania 5.4
- 363ProvidenceRhode Island 5.4
- 363MadisonWisconsin 5.4
- 363WaukeshaWisconsin 5.4
- 363GlendaleArizona 5.4
- 363LincolnCalifornia 5.4
- 363ModestoCalifornia 5.4
- 363TracyCalifornia 5.4
- 363Las VegasNevada 5.4
- 363LubbockTexas 5.4
- 363Apache JunctionArizona 5.4
- 363LongmontColorado 5.4
- 363Brigham CityUtah 5.4
- 394DoverDelaware 5.3
- 394Coconut CreekFlorida 5.3
- 394WestonFlorida 5.3
- 394White OakOhio 5.3
- 394JenksOklahoma 5.3
- 394LimaOhio 5.3
- 394WarrenOhio 5.3
- 394BridgeportConnecticut 5.3
- 402HarrisonburgVirginia 5.2
- 402CharlestonWest Virginia 5.2
- 402DanburyConnecticut 5.2
- 402HartfordConnecticut 5.2
- 402JenisonMichigan 5.2
- 402HarrisburgPennsylvania 5.2
- 402PleasantonCalifornia 5.2
- 402RenoNevada 5.2
- 410FairhopeAlabama 5.1
- 410Winter ParkFlorida 5.1
- 410Lexington-FayetteKentucky 5.1
- 410ShreveportLouisiana 5.1
- 410EssexMaryland 5.1
- 410CaryIllinois 5.1
- 410ElkhartIndiana 5.1
- 410PortlandMaine 5.1
- 410LansingMichigan 5.1
- 410TrentonNew Jersey 5.1
- 410LancasterPennsylvania 5.1
- 410PittsburghPennsylvania 5.1
- 410WilkinsburgPennsylvania 5.1
- 410HurricaneUtah 5.1
- 410Arden-ArcadeCalifornia 5.1
- 425BessemerAlabama 5.0
- 425WilmingtonDelaware 5.0
- 425West PensacolaFlorida 5.0
- 425HagerstownMaryland 5.0
- 425LibertyMissouri 5.0
- 425Ponca CityOklahoma 5.0
- 425AshburnVirginia 5.0
- 425RoanokeVirginia 5.0
- 425FraminghamMassachusetts 5.0
- 425NorristownPennsylvania 5.0
- 425Eau ClaireWisconsin 5.0
- 425MantecaCalifornia 5.0
- 425EnterpriseNevada 5.0
- 425TooeleUtah 5.0
- 425YakimaWashington 5.0
- 440Palm BayFlorida 4.9
- 440ChesterPennsylvania 4.9
- 440YorkPennsylvania 4.9
- 440CookevilleTennessee 4.9
- 440La VistaNebraska 4.9
- 440HolbrookNew York 4.9
- 440YoungstownOhio 4.9
- 440Rio RanchoNew Mexico 4.9
- 440SunnysideWashington 4.9
- 440Summerlin SouthNevada 4.9
- 450AshlandKentucky 4.8
- 450RaymoreMissouri 4.8
- 450Rose HillVirginia 4.8
- 450BrookfieldIllinois 4.8
- 450NorthbrookIllinois 4.8
- 450FlintMichigan 4.8
- 450CarlislePennsylvania 4.8
- 450McKeesportPennsylvania 4.8
- 450ReadingPennsylvania 4.8
- 450AppletonWisconsin 4.8
- 450WeirtonWest Virginia 4.8
- 450Arvadalow-cost sensorsColorado 4.8
- 450Fort CollinsColorado 4.8
- 450CondaIdaho 4.8
- 450Columbia CityWashington 4.8
- 465ElizabethtownKentucky 4.7
- 465Fort ThomasKentucky 4.7
- 465New LondonConnecticut 4.7
- 465BrocktonMassachusetts 4.7
- 465QuincyMassachusetts 4.7
- 465Port HuronMichigan 4.7
- 465SouthfieldMichigan 4.7
- 465TaylorMichigan 4.7
- 465YpsilantiMichigan 4.7
- 465BuffaloNew York 4.7
- 465GahannaOhio 4.7
- 465AltoonaPennsylvania 4.7
- 465BethlehemPennsylvania 4.7
- 465ScrantonPennsylvania 4.7
- 465South MilwaukeeWisconsin 4.7
- 465DenverColorado 4.7
- 481ElktonMaryland 4.6
- 481South LaurelMaryland 4.6
- 481MasonOhio 4.6
- 481WaterburyConnecticut 4.6
- 481Fall RiverMassachusetts 4.6
- 481LowellMassachusetts 4.6
- 481LincolnNebraska 4.6
- 481MedinaOhio 4.6
- 481Shaker HeightsOhio 4.6
- 481AllentownPennsylvania 4.6
- 481Sioux FallsSouth Dakota 4.6
- 481Green BayWisconsin 4.6
- 481Green ValleyArizona 4.6
- 481Palo Altolow-cost sensorsCalifornia 4.6
- 481Dodge CityKansas 4.6
- 481Spring ValleyNevada 4.6
- 481ReddingCalifornia 4.6
- 481RentonWashington 4.6
- 481SpokaneWashington 4.6
- 500BearDelaware 4.5
- 500NicholasvilleKentucky 4.5
- 500Hunt ValleyMaryland 4.5
- 500LynnMassachusetts 4.5
- 500SpringfieldMassachusetts 4.5
- 500PawtucketRhode Island 4.5
- 500Weirton HeightsWest Virginia 4.5
- 500GreeleyColorado 4.5
- 500WindsorColorado 4.5
- 500TacomaWashington 4.5
- 500Picnic Point-North LynnwoodWashington 4.5
- 500RandolphNew Jersey 4.5
- 512PortsmouthNew Hampshire 4.4
- 512AlbanyNew York 4.4
- 512ConcordCalifornia 4.4
- 512San RafaelCalifornia 4.4
- 512HendersonNevada 4.4
- 512MeridianIdaho 4.4
- 512NampaIdaho 4.4
- 512ButteMontana 4.4
- 512SeattleWashington 4.4
- 521Cleveland HeightsOhio 4.3
- 521Lincoln ParkMichigan 4.3
- 521VacavilleCalifornia 4.3
- 521Twin FallsIdaho 4.3
- 521Spokane ValleyWashington 4.3
- 521GilletteWyoming 4.3
- 521Rock SpringsWyoming 4.3
- 528EdgewoodMaryland 4.2
- 528ZionIllinois 4.2
- 528GreenfieldMassachusetts 4.2
- 528EastpointeMichigan 4.2
- 528EriePennsylvania 4.2
- 528ParadiseCalifornia 4.2
- 528Santa RosaCalifornia 4.2
- 528BoulderColorado 4.2
- 536MilfordMassachusetts 4.1
- 536WorcesterMassachusetts 4.1
- 536BellevueNebraska 4.1
- 536PainesvilleOhio 4.1
- 536JohnstownPennsylvania 4.1
- 536State CollegePennsylvania 4.1
- 536TruckeeCalifornia 4.1
- 536PuebloColorado 4.1
- 536PocatelloIdaho 4.1
- 536BellinghamWashington 4.1
- 536Moses LakeWashington 4.1
- 536Port AngelesWashington 4.1
- 536WenatcheeWashington 4.1
- 549NewarkDelaware 4.0
- 549HaverhillMassachusetts 4.0
- 549North ChicopeeMassachusetts 4.0
- 549HermitagePennsylvania 4.0
- 549Spanish SpringsNevada 4.0
- 549Idaho FallsIdaho 4.0
- 549BillingsMontana 4.0
- 549MedfordOregon 4.0
- 549TigardOregon 4.0
- 549HonoluluHawaii 4.0
- 559Cañon CityColorado 3.9
- 559Boulder CityNevada 3.9
- 559Coeur d'AleneIdaho 3.9
- 559AuburnWashington 3.9
- 559BurienWashington 3.9
- 564DerryNew Hampshire 3.8
- 564KeeneNew Hampshire 3.8
- 564RochesterNew York 3.8
- 564MesquiteNevada 3.8
- 564EugeneOregon 3.8
- 569RockvilleMaryland 3.7
- 569KokomoIndiana 3.7
- 569PittsfieldMassachusetts 3.7
- 569SyracuseNew York 3.7
- 569Colorado SpringsColorado 3.7
- 569SheridanWyoming 3.7
- 575AugustaMaine 3.6
- 575LewistonMaine 3.6
- 575RutlandVermont 3.6
- 575BendOregon 3.6
- 575KahuluiHawaii 3.6
- 575Makakilo / Kapolei / Honokai HaleHawaii 3.6
- 581MarquetteMichigan 3.5
- 581ShorelineWashington 3.5
- 581KīheiHawaii 3.5
- 581HiloHawaii 3.5
- 581FairbanksAlaska 3.5
- 586NewburghNew York 3.4
- 586AltamontOregon 3.4
- 586BadgerAlaska 3.4
- 589White PlainsNew York 3.3
- 589Grand JunctionColorado 3.3
- 589Ken CarylColorado 3.3
- 589LittletonColorado 3.3
- 589CanbyOregon 3.3
- 589SalemOregon 3.3
- 589BremertonWashington 3.3
- 589EllensburgWashington 3.3
- 597HopewellVirginia 3.2
- 597BangorMaine 3.2
- 597New CityNew York 3.2
- 597BoiseIdaho 3.2
- 597Grants PassOregon 3.2
- 597PortlandOregon 3.2
- 597LaceyWashington 3.2
- 604BayonneNew Jersey 3.1
- 604Carson CityNevada 3.1
- 604MissoulaMontana 3.1
- 604AshlandOregon 3.1
- 604HermistonOregon 3.1
- 604MilwaukieOregon 3.1
- 604The DallesOregon 3.1
- 604ParklandWashington 3.1
- 612GreshamOregon 3.0
- 612Walla WallaWashington 3.0
- 614UticaNew York 2.9
- 614WoodburnOregon 2.9
- 614CasperWyoming 2.9
- 617RoseburgOregon 2.8
- 617LongviewWashington 2.8
- 617PullmanWashington 2.8
- 617Salmon CreekWashington 2.8
- 621Lexingtonlow-cost sensorsMassachusetts 2.7
- 621AtascaderoCalifornia 2.7
- 621AlbanyOregon 2.7
- 621RedmondOregon 2.7
- 621AberdeenWashington 2.7
- 621CentraliaWashington 2.7
- 621VancouverWashington 2.7
- 628CoventryRhode Island 2.6
- 628AnchorageAlaska 2.6
- 630BeavertonOregon 2.5
- 630Forest GroveOregon 2.5
- 630HillsboroOregon 2.5
- 630LaramieWyoming 2.5
- 634McMinnvilleOregon 2.4
- 634BellevueWashington 2.4
- 634CheyenneWyoming 2.4
- 637DallasOregon 2.3
- 637PendletonOregon 2.3
- 639Tri-CitiesWashington 2.2
- 640LaconiaNew Hampshire 2.1
- 640Oak HarborWashington 2.1
- 642CorvallisOregon 1.8
- 643Mount VernonWashington 1.6
- 643Inglewood-Finn Hilllow-cost sensorsWashington 1.6
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+