SmogRank / Countries / United States / April 2025
Most polluted cities in United States, April 2025
654 cities in United States ranked by their average PM2.5 over the 30 days. Worst: Sunland Park at 28.3 µg/m³, #120 of 2,286 cities in the world. Cleanest: Mount Vernon at 2.0. A city needs measurements on 70% of the days to be ranked.
- 1Sunland ParkNew Mexico 28.3
- 1El PasoTexas 28.3
- 3SocorroTexas 23.9
- 4HobbsNew Mexico 17.1
- 5Corpus ChristiTexas 14.3
- 6Santa Monicalow-cost sensorsCalifornia 13.8
- 7AlbanyGeorgia 13.1
- 8CalexicoCalifornia 12.9
- 9EdinburgTexas 12.8
- 10ConroeTexas 12.5
- 11TallahasseeFlorida 12.3
- 11HoustonTexas 12.3
- 11LaredoTexas 12.3
- 14BrownsvilleTexas 11.9
- 15MissionTexas 11.8
- 16BaytownTexas 11.7
- 17Columbialow-cost sensorsMissouri 11.6
- 18Eagle PassTexas 11.5
- 19Pasadenalow-cost sensorsCalifornia 11.3
- 20PasadenaTexas 11.2
- 21BirminghamAlabama 11.1
- 21San AntonioTexas 11.1
- 23ValdostaGeorgia 11.0
- 23Los AngelesCalifornia 11.0
- 25Jurupa ValleyCalifornia 10.9
- 26SpringdaleArkansas 10.8
- 26ColumbusGeorgia 10.8
- 26AustinTexas 10.8
- 26BrookingsSouth Dakota 10.8
- 26Las CrucesNew Mexico 10.8
- 26OdessaTexas 10.8
- 32Live OakTexas 10.7
- 33Mission BendTexas 10.6
- 33NipomoCalifornia 10.6
- 33Santa BarbaraCalifornia 10.6
- 36East RidgeTennessee 10.5
- 37MaconGeorgia 10.4
- 38DerbyKansas 10.3
- 38WichitaKansas 10.3
- 38San MarcosTexas 10.3
- 41AugustaGeorgia 10.2
- 42GainesvilleGeorgia 10.1
- 42TopekaKansas 10.1
- 44PascagoulaMississippi 9.9
- 44RichmondCalifornia 9.9
- 46College StationTexas 9.8
- 46GaryIndiana 9.8
- 46BurbankCalifornia 9.8
- 49LawrencevilleGeorgia 9.7
- 49ComptonCalifornia 9.7
- 49Candler-McAfeeGeorgia 9.7
- 52MiamiFlorida 9.6
- 52GulfportMississippi 9.6
- 52Missouri CityTexas 9.6
- 52Des MoinesIowa 9.6
- 52BerkeleyCalifornia 9.6
- 57HueytownAlabama 9.5
- 57AtlantaGeorgia 9.5
- 57GalvestonTexas 9.5
- 57WyomingMichigan 9.5
- 57MidwayFlorida 9.5
- 62Baton RougeLouisiana 9.4
- 62Oklahoma CityOklahoma 9.4
- 62WaterlooIowa 9.4
- 65OcalaFlorida 9.3
- 65DurhamNorth Carolina 9.3
- 65TulsaOklahoma 9.3
- 65FontanaCalifornia 9.3
- 65Santa ClaritaCalifornia 9.3
- 70Ferry PassFlorida 9.2
- 70RedfordMichigan 9.2
- 70RiversideCalifornia 9.2
- 70HelenaMontana 9.2
- 74Bonita SpringsFlorida 9.1
- 74Palm CityFlorida 9.1
- 74Saint JosephMissouri 9.1
- 74HattiesburgMississippi 9.1
- 74CharlottesvilleVirginia 9.1
- 79GadsdenAlabama 9.0
- 79PrichardAlabama 9.0
- 79TrussvilleAlabama 9.0
- 79VeniceFlorida 9.0
- 79Warner RobinsGeorgia 9.0
- 79SulphurLouisiana 9.0
- 79ChattanoogaTennessee 9.0
- 79Fort WorthTexas 9.0
- 87Belle GladeFlorida 8.9
- 87Ponte Vedra BeachFlorida 8.9
- 87Port ArthurTexas 8.9
- 87TaylorTexas 8.9
- 87TexarkanaTexas 8.9
- 92MontgomeryAlabama 8.8
- 92Fort LauderdaleFlorida 8.8
- 92JacksonMississippi 8.8
- 92BeltonTexas 8.8
- 92Hawthornelow-cost sensorsCalifornia 8.8
- 92San DiegoCalifornia 8.8
- 92Great FallsMontana 8.8
- 99TampaFlorida 8.7
- 99ValricoFlorida 8.7
- 99La PorteTexas 8.7
- 102PortervilleCalifornia 8.6
- 103St. PetersburgFlorida 8.5
- 103McDonoughGeorgia 8.5
- 103SavannahGeorgia 8.5
- 103CharlotteNorth Carolina 8.5
- 103Ponca CityOklahoma 8.5
- 103North CharlestonSouth Carolina 8.5
- 103CorsicanaTexas 8.5
- 103Agouralow-cost sensorsCalifornia 8.5
- 103AnaheimCalifornia 8.5
- 112Deerfield BeachFlorida 8.4
- 112Oak RidgeFlorida 8.4
- 112ChalmetteLouisiana 8.4
- 112LafayetteLouisiana 8.4
- 112GreenvilleSouth Carolina 8.4
- 112AnkenyIowa 8.4
- 112BrawleyCalifornia 8.4
- 112Inglewoodlow-cost sensorsCalifornia 8.4
- 120DavieFlorida 8.3
- 120OlatheKansas 8.3
- 120KennerLouisiana 8.3
- 120MorrisvilleNorth Carolina 8.3
- 120ConwaySouth Carolina 8.3
- 120FlorenceSouth Carolina 8.3
- 120SpartanburgSouth Carolina 8.3
- 120KnoxvilleTennessee 8.3
- 120MankatoMinnesota 8.3
- 120NogalesArizona 8.3
- 130FairhopeAlabama 8.2
- 130West PensacolaFlorida 8.2
- 130AthensGeorgia 8.2
- 130Terre HauteIndiana 8.2
- 130HernandoMississippi 8.2
- 130Carsonlow-cost sensorsCalifornia 8.2
- 130GlendoraCalifornia 8.2
- 130VisaliaCalifornia 8.2
- 138Fort MyersFlorida 8.1
- 138WellingtonFlorida 8.1
- 138Cedar RapidsIowa 8.1
- 138OregonOhio 8.1
- 138Simi ValleyCalifornia 8.1
- 143BessemerAlabama 8.0
- 143Winston-SalemNorth Carolina 8.0
- 143MiddletownOhio 8.0
- 143MooreOklahoma 8.0
- 143Iowa CityIowa 8.0
- 143LivermoreCalifornia 8.0
- 149Delray BeachFlorida 7.9
- 149ClemmonsNorth Carolina 7.9
- 149HickoryNorth Carolina 7.9
- 149JenksOklahoma 7.9
- 149Saint AndrewsSouth Carolina 7.9
- 149ColumbiaTennessee 7.9
- 149San JoseCalifornia 7.9
- 156DecaturAlabama 7.8
- 156Daytona BeachFlorida 7.8
- 156East LakeFlorida 7.8
- 156IndianapolisIndiana 7.8
- 156ClaytonNorth Carolina 7.8
- 156Oconomowoclow-cost sensorsWisconsin 7.8
- 156Arroyo GrandeCalifornia 7.8
- 156BakersfieldCalifornia 7.8
- 156IndioCalifornia 7.8
- 156Torrancelow-cost sensorsCalifornia 7.8
- 156La Crescenta-Montroselow-cost sensorsCalifornia 7.8
- 167HuntsvilleAlabama 7.7
- 167SarasotaFlorida 7.7
- 167East Saint LouisIllinois 7.7
- 167Granite CityIllinois 7.7
- 167St. LouisMissouri 7.7
- 167RaleighNorth Carolina 7.7
- 167McAlesterOklahoma 7.7
- 167DoltonIllinois 7.7
- 167AnacortesWashington 7.7
- 176Fort SmithArkansas 7.6
- 176FayettevilleNorth Carolina 7.6
- 176Roanoke RapidsNorth Carolina 7.6
- 176SaginawTexas 7.6
- 176ClintonIowa 7.6
- 176PeoriaIllinois 7.6
- 176MillcreekUtah 7.6
- 183Upper AltonIllinois 7.5
- 183BartlettTennessee 7.5
- 183NashvilleTennessee 7.5
- 183Apple ValleyMinnesota 7.5
- 183El CajonCalifornia 7.5
- 183WoodlandCalifornia 7.5
- 183Four CornersFlorida 7.5
- 190Little RockArkansas 7.4
- 190JacksonvilleFlorida 7.4
- 190Winter ParkFlorida 7.4
- 190JeffersonvilleIndiana 7.4
- 190BaltimoreMaryland 7.4
- 190GreensboroNorth Carolina 7.4
- 190ColumbusOhio 7.4
- 190EdmondOklahoma 7.4
- 190MuscatineIowa 7.4
- 190LafayetteIndiana 7.4
- 190BurnsvilleMinnesota 7.4
- 190HanfordCalifornia 7.4
- 190LompocCalifornia 7.4
- 190OaklandCalifornia 7.4
- 190OxnardCalifornia 7.4
- 190PowayCalifornia 7.4
- 206GainesvilleFlorida 7.3
- 206BrunswickGeorgia 7.3
- 206EvansvilleIndiana 7.3
- 206Kansas CityKansas 7.3
- 206New OrleansLouisiana 7.3
- 206RaymoreMissouri 7.3
- 206DentonTexas 7.3
- 206DavenportIowa 7.3
- 206East ChicagoIndiana 7.3
- 206HammondIndiana 7.3
- 206MinneapolisMinnesota 7.3
- 206YumaArizona 7.3
- 206Long BeachCalifornia 7.3
- 206ThorntonColorado 7.3
- 220Safety HarborFlorida 7.2
- 220Elmwood ParkIllinois 7.2
- 220Franklin ParkIllinois 7.2
- 220JolietIllinois 7.2
- 220NapervilleIllinois 7.2
- 220LincolnNebraska 7.2
- 220LindenNew Jersey 7.2
- 220West MifflinPennsylvania 7.2
- 220WatertownSouth Dakota 7.2
- 220LubbockTexas 7.2
- 230Valley StationKentucky 7.1
- 230AshevilleNorth Carolina 7.1
- 230PhiladelphiaPennsylvania 7.1
- 230JacksonTennessee 7.1
- 230MaryvilleTennessee 7.1
- 230MolineIllinois 7.1
- 230HollandMichigan 7.1
- 230ElizabethNew Jersey 7.1
- 230FresnoCalifornia 7.1
- 230Lomitalow-cost sensorsCalifornia 7.1
- 230OceansideCalifornia 7.1
- 230VictorvilleCalifornia 7.1
- 242Coconut CreekFlorida 7.0
- 242OrlandoFlorida 7.0
- 242WestonFlorida 7.0
- 242Kansas CityMissouri 7.0
- 242NorwoodOhio 7.0
- 242DyersburgTennessee 7.0
- 242HendersonvilleTennessee 7.0
- 242Calumet CityIllinois 7.0
- 242ElginIllinois 7.0
- 251LouisvilleKentucky 6.9
- 251OwensboroKentucky 6.9
- 251LemayMissouri 6.9
- 251HarrisonburgVirginia 6.9
- 251HuntingtonWest Virginia 6.9
- 251CaryIllinois 6.9
- 251EwingNew Jersey 6.9
- 251MaranaArizona 6.9
- 251StocktonCalifornia 6.9
- 260Fruit CoveFlorida 6.8
- 260PortsmouthOhio 6.8
- 260ChesapeakeVirginia 6.8
- 260ChicagoIllinois 6.8
- 260DearbornMichigan 6.8
- 260La VistaNebraska 6.8
- 260SteubenvilleOhio 6.8
- 260BensalemPennsylvania 6.8
- 260MilwaukeeWisconsin 6.8
- 260WheelingWest Virginia 6.8
- 260BanningCalifornia 6.8
- 260RentonWashington 6.8
- 272Lake MaryFlorida 6.7
- 272ArnoldMissouri 6.7
- 272AshburnVirginia 6.7
- 272RichmondVirginia 6.7
- 272RoanokeVirginia 6.7
- 272BloomingtonIllinois 6.7
- 272Fort WayneIndiana 6.7
- 272ShakopeeMinnesota 6.7
- 272Grand IslandNebraska 6.7
- 272OmahaNebraska 6.7
- 272LebanonPennsylvania 6.7
- 283FishersIndiana 6.6
- 283LeawoodKansas 6.6
- 283ScaggsvilleMaryland 6.6
- 283SpringfieldMissouri 6.6
- 283DaytonOhio 6.6
- 283SpringfieldOhio 6.6
- 283White OakOhio 6.6
- 283Oak LawnIllinois 6.6
- 283Bay CityMichigan 6.6
- 283RochesterMinnesota 6.6
- 283New York CityNew York 6.6
- 283CantonOhio 6.6
- 283ClevelandOhio 6.6
- 283AlbuquerqueNew Mexico 6.6
- 283LewistonIdaho 6.6
- 283RexburgIdaho 6.6
- 283OremUtah 6.6
- 300DecaturIllinois 6.5
- 300HagerstownMaryland 6.5
- 300CincinnatiOhio 6.5
- 300CookevilleTennessee 6.5
- 300KingsportTennessee 6.5
- 300SpringfieldVirginia 6.5
- 300AuroraIllinois 6.5
- 300ChampaignIllinois 6.5
- 300RockfordIllinois 6.5
- 300BellevueNebraska 6.5
- 300PerrysburgOhio 6.5
- 300WestervilleOhio 6.5
- 300CorcoranCalifornia 6.5
- 300SalinasCalifornia 6.5
- 300Spanish SpringsNevada 6.5
- 315SpringfieldIllinois 6.4
- 315BloomingtonIndiana 6.4
- 315South VinelandNew Jersey 6.4
- 315LawtonOklahoma 6.4
- 315East HamptonVirginia 6.4
- 315Des PlainesIllinois 6.4
- 315DetroitMichigan 6.4
- 315MadisonWisconsin 6.4
- 315PhoenixArizona 6.4
- 315ChicoCalifornia 6.4
- 315Thousand OaksCalifornia 6.4
- 315West Valley CityUtah 6.4
- 327PaducahKentucky 6.3
- 327WashingtonDistrict of Columbia 6.3
- 327Lexington-FayetteKentucky 6.3
- 327University CityMissouri 6.3
- 327YorkPennsylvania 6.3
- 327ClarksvilleTennessee 6.3
- 327CharlestonWest Virginia 6.3
- 327FlintMichigan 6.3
- 327KalamazooMichigan 6.3
- 327Saint PaulMinnesota 6.3
- 327WaukeshaWisconsin 6.3
- 327Casa GrandeArizona 6.3
- 327Santa PaulaCalifornia 6.3
- 340ElizabethtownKentucky 6.2
- 340JeffersontownKentucky 6.2
- 340Hunt ValleyMaryland 6.2
- 340LibertyMissouri 6.2
- 340GreenvilleNorth Carolina 6.2
- 340Atlantic CityNew Jersey 6.2
- 340Michigan CityIndiana 6.2
- 340FolsomCalifornia 6.2
- 340MaderaCalifornia 6.2
- 340RosevilleCalifornia 6.2
- 340TurlockCalifornia 6.2
- 340UkiahCalifornia 6.2
- 340Spanish ForkUtah 6.2
- 353WilmingtonDelaware 6.1
- 353JasperIndiana 6.1
- 353LebanonOhio 6.1
- 353ChesterPennsylvania 6.1
- 353MuncieIndiana 6.1
- 353LancasterPennsylvania 6.1
- 353MantecaCalifornia 6.1
- 360NicholasvilleKentucky 6.0
- 360PennsaukenNew Jersey 6.0
- 360Grand RapidsMichigan 6.0
- 360TrentonNew Jersey 6.0
- 360HarrisburgPennsylvania 6.0
- 360PittsburghPennsylvania 6.0
- 360WilkinsburgPennsylvania 6.0
- 360Fort CollinsColorado 6.0
- 360BozemanMontana 6.0
- 360Salt Lake CityUtah 6.0
- 360Oxon Hill-GlassmanorMaryland 6.0
- 371Saint MatthewsKentucky 5.9
- 371Toms RiverNew Jersey 5.9
- 371Rose HillVirginia 5.9
- 371PortageIndiana 5.9
- 371BlaineMinnesota 5.9
- 371Saint MichaelMinnesota 5.9
- 371WarrenOhio 5.9
- 371BethlehemPennsylvania 5.9
- 371ClovisCalifornia 5.9
- 371San FranciscoCalifornia 5.9
- 371Dodge CityKansas 5.9
- 371BountifulUtah 5.9
- 383AshlandKentucky 5.8
- 383EssexMaryland 5.8
- 383SewellNew Jersey 5.8
- 383AndersonIndiana 5.8
- 383ElkhartIndiana 5.8
- 383South BendIndiana 5.8
- 383AkronOhio 5.8
- 383DublinOhio 5.8
- 383CarlislePennsylvania 5.8
- 383NorristownPennsylvania 5.8
- 383ReadingPennsylvania 5.8
- 383Lake ElsinoreCalifornia 5.8
- 383DenverColorado 5.8
- 383LongmontColorado 5.8
- 383West JordanUtah 5.8
- 383Columbia CityWashington 5.8
- 399DoverDelaware 5.7
- 399BrookfieldIllinois 5.7
- 399JenisonMichigan 5.7
- 399PatersonNew Jersey 5.7
- 399ToledoOhio 5.7
- 399PawtucketRhode Island 5.7
- 399Eau ClaireWisconsin 5.7
- 399South MilwaukeeWisconsin 5.7
- 399ModestoCalifornia 5.7
- 399HerrimanUtah 5.7
- 399SunnysideWashington 5.7
- 410New AlbanyIndiana 5.6
- 410ZionIllinois 5.6
- 410Lincoln ParkMichigan 5.6
- 410SouthfieldMichigan 5.6
- 410Jersey CityNew Jersey 5.6
- 410BuffaloNew York 5.6
- 410YoungstownOhio 5.6
- 410AllentownPennsylvania 5.6
- 410McKeesportPennsylvania 5.6
- 410FillmoreCalifornia 5.6
- 410GaltCalifornia 5.6
- 410LincolnCalifornia 5.6
- 410Rio RanchoNew Mexico 5.6
- 410Carson CityNevada 5.6
- 410Cedar CityUtah 5.6
- 410TacomaWashington 5.6
- 426NorthbrookIllinois 5.5
- 426YpsilantiMichigan 5.5
- 426Fort LeeNew Jersey 5.5
- 426AppletonWisconsin 5.5
- 426WeirtonWest Virginia 5.5
- 426FlagstaffArizona 5.5
- 426MesaArizona 5.5
- 426TempeArizona 5.5
- 426San LeandroCalifornia 5.5
- 426South San Franciscolow-cost sensorsCalifornia 5.5
- 426TracyCalifornia 5.5
- 426Yuba CityCalifornia 5.5
- 426AltamontOregon 5.5
- 426Arden-ArcadeCalifornia 5.5
- 440BearDelaware 5.4
- 440ColumbusIndiana 5.4
- 440EdgewoodMaryland 5.4
- 440EastpointeMichigan 5.4
- 440LansingMichigan 5.4
- 440Saint CloudMinnesota 5.4
- 440New BrunswickNew Jersey 5.4
- 440ScrantonPennsylvania 5.4
- 440SacramentoCalifornia 5.4
- 440Arvadalow-cost sensorsColorado 5.4
- 450ShreveportLouisiana 5.3
- 450ElktonMaryland 5.3
- 450New HavenConnecticut 5.3
- 450Port HuronMichigan 5.3
- 450LimaOhio 5.3
- 450AltoonaPennsylvania 5.3
- 450Green BayWisconsin 5.3
- 450TucsonArizona 5.3
- 450LancasterCalifornia 5.3
- 450PleasantonCalifornia 5.3
- 450Lakewoodlow-cost sensorsColorado 5.3
- 450HighlandUtah 5.3
- 450North OgdenUtah 5.3
- 450SpokaneWashington 5.3
- 464Fort ThomasKentucky 5.2
- 464TaylorMichigan 5.2
- 464JohnstownPennsylvania 5.2
- 464State CollegePennsylvania 5.2
- 464BridgeportConnecticut 5.2
- 464Casas AdobesArizona 5.2
- 464GlendaleArizona 5.2
- 464GilroyCalifornia 5.2
- 464Apache JunctionArizona 5.2
- 464ReddingCalifornia 5.2
- 464MoscowIdaho 5.2
- 464ButteMontana 5.2
- 464SeattleWashington 5.2
- 464WenatcheeWashington 5.2
- 464HonoluluHawaii 5.2
- 479RockvilleMaryland 5.1
- 479PleasantvilleNew Jersey 5.1
- 479HartfordConnecticut 5.1
- 479West FargoNorth Dakota 5.1
- 479EriePennsylvania 5.1
- 479SuperiorWisconsin 5.1
- 479Weirton HeightsWest Virginia 5.1
- 479Redwood CityCalifornia 5.1
- 479San Luis ObispoCalifornia 5.1
- 479NampaIdaho 5.1
- 479Twin FallsIdaho 5.1
- 479BillingsMontana 5.1
- 491NewarkDelaware 5.0
- 491Cleveland HeightsOhio 5.0
- 491KokomoIndiana 5.0
- 491BostonMassachusetts 5.0
- 491HolbrookNew York 5.0
- 491Shaker HeightsOhio 5.0
- 491ProvidenceRhode Island 5.0
- 491MercedCalifornia 5.0
- 491Las VegasNevada 5.0
- 491Rapid CitySouth Dakota 5.0
- 491Brigham CityUtah 5.0
- 491Spokane ValleyWashington 5.0
- 503Palm BayFlorida 4.9
- 503South LaurelMaryland 4.9
- 503DuluthMinnesota 4.9
- 503RochesterNew York 4.9
- 503MedinaOhio 4.9
- 503PainesvilleOhio 4.9
- 503RenoNevada 4.9
- 503HurricaneUtah 4.9
- 503GreeleyColorado 4.9
- 503WindsorColorado 4.9
- 503ParklandWashington 4.9
- 503Port AngelesWashington 4.9
- 515DanburyConnecticut 4.8
- 515HermitagePennsylvania 4.8
- 515Goletalow-cost sensorsCalifornia 4.8
- 515RidgecrestCalifornia 4.8
- 515MedfordOregon 4.8
- 515MagnaUtah 4.8
- 515YakimaWashington 4.8
- 515KahuluiHawaii 4.8
- 515Makakilo / Kapolei / Honokai HaleHawaii 4.8
- 524MasonOhio 4.7
- 524HopewellVirginia 4.7
- 524FraminghamMassachusetts 4.7
- 524PortlandMaine 4.7
- 524Palo Altolow-cost sensorsCalifornia 4.7
- 524Santa CruzCalifornia 4.7
- 524GreshamOregon 4.7
- 524TigardOregon 4.7
- 524AuburnWashington 4.7
- 524Picnic Point-North LynnwoodWashington 4.7
- 534New LondonConnecticut 4.6
- 534SpringfieldMassachusetts 4.6
- 534AlbanyNew York 4.6
- 534HollisterCalifornia 4.6
- 534VacavilleCalifornia 4.6
- 534BoulderColorado 4.6
- 534MeridianIdaho 4.6
- 534Rock SpringsWyoming 4.6
- 542BrocktonMassachusetts 4.5
- 542Fall RiverMassachusetts 4.5
- 542GahannaOhio 4.5
- 542Sioux FallsSouth Dakota 4.5
- 542DavisCalifornia 4.5
- 542LittletonColorado 4.5
- 542PuebloColorado 4.5
- 542Idaho FallsIdaho 4.5
- 542GilletteWyoming 4.5
- 542SheridanWyoming 4.5
- 542KīheiHawaii 4.5
- 553WaterburyConnecticut 4.4
- 553ParadiseCalifornia 4.4
- 553Grand JunctionColorado 4.4
- 553EnterpriseNevada 4.4
- 553Coeur d'AleneIdaho 4.4
- 558LowellMassachusetts 4.3
- 558BayonneNew Jersey 4.3
- 558SyracuseNew York 4.3
- 558Cañon CityColorado 4.3
- 558EugeneOregon 4.3
- 558Grants PassOregon 4.3
- 558TooeleUtah 4.3
- 558Moses LakeWashington 4.3
- 566LynnMassachusetts 4.2
- 566QuincyMassachusetts 4.2
- 566WorcesterMassachusetts 4.2
- 566NewburghNew York 4.2
- 566AberdeenSouth Dakota 4.2
- 566El CentroCalifornia 4.2
- 566LaceyWashington 4.2
- 566Summerlin SouthNevada 4.2
- 574GreenfieldMassachusetts 4.1
- 574UticaNew York 4.1
- 574ConcordCalifornia 4.1
- 574San RafaelCalifornia 4.1
- 574Windsorlow-cost sensorsCalifornia 4.1
- 574Ken CarylColorado 4.1
- 574HendersonNevada 4.1
- 574Spring ValleyNevada 4.1
- 574BellinghamWashington 4.1
- 574BadgerAlaska 4.1
- 574RandolphNew Jersey 4.1
- 585PittsfieldMassachusetts 4.0
- 585New CityNew York 4.0
- 585White PlainsNew York 4.0
- 585RutlandVermont 4.0
- 585Colorado SpringsColorado 4.0
- 585BismarckNorth Dakota 4.0
- 585ShorelineWashington 4.0
- 592North ChicopeeMassachusetts 3.9
- 592Santa RosaCalifornia 3.9
- 592TruckeeCalifornia 3.9
- 592BendOregon 3.9
- 596HaverhillMassachusetts 3.8
- 596MilfordMassachusetts 3.8
- 596AugustaMaine 3.8
- 596KeeneNew Hampshire 3.8
- 596PortsmouthNew Hampshire 3.8
- 596SalemOregon 3.8
- 602OrcuttCalifornia 3.7
- 602PocatelloIdaho 3.7
- 602CanbyOregon 3.7
- 602Coos BayOregon 3.7
- 602The DallesOregon 3.7
- 602EllensburgWashington 3.7
- 608BangorMaine 3.6
- 608LewistonMaine 3.6
- 608BoiseIdaho 3.6
- 608HermistonOregon 3.6
- 612DerryNew Hampshire 3.5
- 612MesquiteNevada 3.5
- 612AshlandOregon 3.5
- 612MilwaukieOregon 3.5
- 612PortlandOregon 3.5
- 612WoodburnOregon 3.5
- 612LongviewWashington 3.5
- 612Walla WallaWashington 3.5
- 612FairbanksAlaska 3.5
- 621Boulder CityNevada 3.4
- 621AlbanyOregon 3.4
- 621RoseburgOregon 3.4
- 621CentraliaWashington 3.4
- 621CasperWyoming 3.4
- 621HiloHawaii 3.4
- 627MarquetteMichigan 3.3
- 627Green ValleyArizona 3.3
- 627AberdeenWashington 3.3
- 627Salmon CreekWashington 3.3
- 627VancouverWashington 3.3
- 632MissoulaMontana 3.2
- 632HillsboroOregon 3.2
- 632Oak HarborWashington 3.2
- 632PullmanWashington 3.2
- 636PendletonOregon 3.1
- 636BremertonWashington 3.1
- 636AnchorageAlaska 3.1
- 639RedmondOregon 3.0
- 639Tri-CitiesWashington 3.0
- 641Florinlow-cost sensorsCalifornia 2.9
- 641LaramieWyoming 2.9
- 643McMinnvilleOregon 2.8
- 644AtascaderoCalifornia 2.7
- 644DallasOregon 2.7
- 644Forest GroveOregon 2.7
- 644BellevueWashington 2.7
- 644CheyenneWyoming 2.7
- 649CoventryRhode Island 2.6
- 650LaconiaNew Hampshire 2.5
- 650Inglewood-Finn Hilllow-cost sensorsWashington 2.5
- 652PrescottArizona 2.2
- 653CorvallisOregon 2.0
- 653Mount VernonWashington 2.0
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+