SmogRank / Countries / United States / June 2024
Most polluted cities in United States, June 2024
616 cities in United States ranked by their average PM2.5 over the 30 days. Worst: Badger at 26.1 µg/m³, #25 of 1,986 cities in the world. Cleanest: Marysville at 1.1. A city needs measurements on 70% of the days to be ranked.
- 1BadgerAlaska 26.1
- 2FairbanksAlaska 24.8
- 3MissionTexas 17.2
- 4FontanaCalifornia 15.6
- 5Los AngelesCalifornia 14.9
- 6Corpus ChristiTexas 14.2
- 6Santa ClaritaCalifornia 14.2
- 8EdinburgTexas 14.0
- 9LaredoTexas 13.9
- 9Jurupa ValleyCalifornia 13.9
- 11La Crescenta-Montroselow-cost sensorsCalifornia 13.7
- 12RichmondCalifornia 13.3
- 13ConroeTexas 13.2
- 13VisaliaCalifornia 13.2
- 15HoustonTexas 13.1
- 15RiversideCalifornia 13.1
- 17BurbankCalifornia 12.9
- 18BirminghamAlabama 12.7
- 18GlendoraCalifornia 12.7
- 20GainesvilleGeorgia 12.6
- 21LawrencevilleGeorgia 12.5
- 22Live OakTexas 12.4
- 23Missouri CityTexas 12.3
- 24ScaggsvilleMaryland 12.2
- 24BerkeleyCalifornia 12.2
- 24BrawleyCalifornia 12.2
- 27PasadenaTexas 12.1
- 28BrownsvilleTexas 12.0
- 28IndioCalifornia 12.0
- 30BartlettTennessee 11.9
- 30DallasTexas 11.9
- 30SaginawTexas 11.9
- 33ShreveportLouisiana 11.8
- 33AustinTexas 11.8
- 35Little RockArkansas 11.6
- 36SpartanburgSouth Carolina 11.5
- 37TexarkanaTexas 11.4
- 38West MifflinPennsylvania 11.3
- 38El CentroCalifornia 11.3
- 40BeltonTexas 11.2
- 40BakersfieldCalifornia 11.2
- 42SpringdaleArkansas 11.1
- 42BanningCalifornia 11.1
- 42Candler-McAfeeGeorgia 11.1
- 45East RidgeTennessee 11.0
- 45VictorvilleCalifornia 11.0
- 47Mission BendTexas 10.9
- 47Eagle PassTexas 10.9
- 49Agouralow-cost sensorsCalifornia 10.8
- 49ClovisCalifornia 10.8
- 51BaytownTexas 10.7
- 51PortervilleCalifornia 10.7
- 53St. LouisMissouri 10.6
- 53Saint AndrewsSouth Carolina 10.6
- 53San AntonioTexas 10.6
- 56CorsicanaTexas 10.5
- 56Chula VistaCalifornia 10.5
- 56San JoseCalifornia 10.5
- 59Forest ParkGeorgia 10.4
- 59WyomingMichigan 10.4
- 59MillcreekUtah 10.4
- 59OremUtah 10.4
- 63GadsdenAlabama 10.2
- 63College StationTexas 10.2
- 63Fort WorthTexas 10.2
- 63El CajonCalifornia 10.2
- 63FresnoCalifornia 10.2
- 63Lake ElsinoreCalifornia 10.2
- 63PowayCalifornia 10.2
- 70LafayetteLouisiana 10.1
- 70CantonOhio 10.1
- 72Baton RougeLouisiana 10.0
- 72ClevelandOhio 10.0
- 72CalexicoCalifornia 10.0
- 75KennesawGeorgia 9.9
- 75WestervilleOhio 9.9
- 75AnaheimCalifornia 9.9
- 75Simi ValleyCalifornia 9.9
- 79HickoryNorth Carolina 9.8
- 79DentonTexas 9.8
- 81DurhamNorth Carolina 9.7
- 81PortsmouthOhio 9.7
- 81WarrenOhio 9.7
- 81ComptonCalifornia 9.7
- 81HanfordCalifornia 9.7
- 81Santa Monicalow-cost sensorsCalifornia 9.7
- 87CincinnatiOhio 9.6
- 87ColumbusOhio 9.6
- 87MiddletownOhio 9.6
- 87BensalemPennsylvania 9.6
- 87WilkinsburgPennsylvania 9.6
- 87Inglewoodlow-cost sensorsCalifornia 9.6
- 93PhiladelphiaPennsylvania 9.5
- 93HollisterCalifornia 9.5
- 93OaklandCalifornia 9.5
- 93San DiegoCalifornia 9.5
- 97Winston-SalemNorth Carolina 9.4
- 97KnoxvilleTennessee 9.4
- 97EwingNew Jersey 9.4
- 97OregonOhio 9.4
- 97PittsburghPennsylvania 9.4
- 97FillmoreCalifornia 9.4
- 97Carsonlow-cost sensorsCalifornia 9.4
- 97Hawthornelow-cost sensorsCalifornia 9.4
- 97El PasoTexas 9.4
- 106ColumbusGeorgia 9.3
- 106MaconGeorgia 9.3
- 106NorwoodOhio 9.3
- 106Yuba CityCalifornia 9.3
- 110CharlotteNorth Carolina 9.2
- 110MaryvilleTennessee 9.2
- 110SteubenvilleOhio 9.2
- 110ModestoCalifornia 9.2
- 110WoodlandCalifornia 9.2
- 110Twin FallsIdaho 9.2
- 116BessemerAlabama 9.1
- 116AtlantaGeorgia 9.1
- 116Roanoke RapidsNorth Carolina 9.1
- 116FlorenceSouth Carolina 9.1
- 116La PorteTexas 9.1
- 116San MarcosTexas 9.1
- 116Torrancelow-cost sensorsCalifornia 9.1
- 123DecaturAlabama 9.0
- 123Fort LauderdaleFlorida 9.0
- 123OcalaFlorida 9.0
- 123IndianapolisIndiana 9.0
- 123FayettevilleNorth Carolina 9.0
- 123SpringfieldOhio 9.0
- 123Oklahoma CityOklahoma 9.0
- 123Port ArthurTexas 9.0
- 131Phenix CityAlabama 8.9
- 131TrussvilleAlabama 8.9
- 131ClemmonsNorth Carolina 8.9
- 131GreensboroNorth Carolina 8.9
- 131MorrisvilleNorth Carolina 8.9
- 131GreenvilleSouth Carolina 8.9
- 131TaylorTexas 8.9
- 131WheelingWest Virginia 8.9
- 131MaderaCalifornia 8.9
- 131MidwayFlorida 8.9
- 141RedfordMichigan 8.8
- 141McKeesportPennsylvania 8.8
- 141Casa GrandeArizona 8.8
- 141SalinasCalifornia 8.8
- 145Warner RobinsGeorgia 8.7
- 145Hunt ValleyMaryland 8.7
- 145Columbialow-cost sensorsMissouri 8.7
- 145LexingtonNorth Carolina 8.7
- 145HendersonvilleTennessee 8.7
- 145DearbornMichigan 8.7
- 145WeirtonWest Virginia 8.7
- 145San FranciscoCalifornia 8.7
- 145StocktonCalifornia 8.7
- 145TurlockCalifornia 8.7
- 145TooeleUtah 8.7
- 156Ponte Vedra BeachFlorida 8.6
- 156DaytonOhio 8.6
- 156AshburnVirginia 8.6
- 156BrookfieldIllinois 8.6
- 156TrentonNew Jersey 8.6
- 156AlbanyNew York 8.6
- 156DublinOhio 8.6
- 156RosevilleCalifornia 8.6
- 156San LeandroCalifornia 8.6
- 165WashingtonDistrict of Columbia 8.5
- 165ValdostaGeorgia 8.5
- 165Wake Forestlow-cost sensorsNorth Carolina 8.5
- 165MooreOklahoma 8.5
- 165GaryIndiana 8.5
- 165HollandMichigan 8.5
- 165Arroyo GrandeCalifornia 8.5
- 165Thousand OaksCalifornia 8.5
- 173NewarkDelaware 8.4
- 173AthensGeorgia 8.4
- 173McDonoughGeorgia 8.4
- 173JasperIndiana 8.4
- 173JeffersonvilleIndiana 8.4
- 173SulphurLouisiana 8.4
- 173Saint JosephMissouri 8.4
- 173CookevilleTennessee 8.4
- 173HuntingtonWest Virginia 8.4
- 173Jersey CityNew Jersey 8.4
- 173LindenNew Jersey 8.4
- 173PatersonNew Jersey 8.4
- 173Lomitalow-cost sensorsCalifornia 8.4
- 173OdessaTexas 8.4
- 187PrichardAlabama 8.3
- 187RaleighNorth Carolina 8.3
- 187PennsaukenNew Jersey 8.3
- 187McAlesterOklahoma 8.3
- 187KalamazooMichigan 8.3
- 187HarrisburgPennsylvania 8.3
- 187GaltCalifornia 8.3
- 194MontgomeryAlabama 8.2
- 194EvansvilleIndiana 8.2
- 194Valley StationKentucky 8.2
- 194ChalmetteLouisiana 8.2
- 194New York CityNew York 8.2
- 194YoungstownOhio 8.2
- 194ScrantonPennsylvania 8.2
- 194YumaArizona 8.2
- 194OceansideCalifornia 8.2
- 194San RafaelCalifornia 8.2
- 194HobbsNew Mexico 8.2
- 205AugustaGeorgia 8.1
- 205East Saint LouisIllinois 8.1
- 205HernandoMississippi 8.1
- 205ClaytonNorth Carolina 8.1
- 205TulsaOklahoma 8.1
- 205CorcoranCalifornia 8.1
- 205Long BeachCalifornia 8.1
- 205Arden-ArcadeCalifornia 8.1
- 213HuntsvilleAlabama 8.0
- 213MiamiFlorida 8.0
- 213RockvilleMaryland 8.0
- 213JacksonTennessee 8.0
- 213KingsportTennessee 8.0
- 213GalvestonTexas 8.0
- 213RoanokeVirginia 8.0
- 213ElizabethNew Jersey 8.0
- 213AkronOhio 8.0
- 213PerrysburgOhio 8.0
- 213Weirton HeightsWest Virginia 8.0
- 213MantecaCalifornia 8.0
- 213NipomoCalifornia 8.0
- 213SacramentoCalifornia 8.0
- 213Santa CruzCalifornia 8.0
- 213West JordanUtah 8.0
- 229HattiesburgMississippi 7.9
- 229AshevilleNorth Carolina 7.9
- 229EdmondOklahoma 7.9
- 229CharlestonWest Virginia 7.9
- 229DanburyConnecticut 7.9
- 229AllentownPennsylvania 7.9
- 229LebanonPennsylvania 7.9
- 229UkiahCalifornia 7.9
- 237SpringfieldMissouri 7.8
- 237ColumbiaTennessee 7.8
- 237CharlottesvilleVirginia 7.8
- 237HarrisonburgVirginia 7.8
- 237RandolphNew Jersey 7.8
- 242West MemphisArkansas 7.7
- 242East LakeFlorida 7.7
- 242TallahasseeFlorida 7.7
- 242JeffersontownKentucky 7.7
- 242LouisvilleKentucky 7.7
- 242JenksOklahoma 7.7
- 242FlintMichigan 7.7
- 242New BrunswickNew Jersey 7.7
- 242BuffaloNew York 7.7
- 242Oxon Hill-GlassmanorMaryland 7.7
- 252Granite CityIllinois 7.6
- 252Saint MatthewsKentucky 7.6
- 252White OakOhio 7.6
- 252Fort WayneIndiana 7.6
- 252LimaOhio 7.6
- 252JohnstownPennsylvania 7.6
- 252HelenaMontana 7.6
- 259Bonita SpringsFlorida 7.5
- 259ColumbusIndiana 7.5
- 259JacksonMississippi 7.5
- 259SewellNew Jersey 7.5
- 259Toms RiverNew Jersey 7.5
- 259North CharlestonSouth Carolina 7.5
- 259ClarksvilleTennessee 7.5
- 259CaryIllinois 7.5
- 259Franklin ParkIllinois 7.5
- 259MuncieIndiana 7.5
- 259Fort LeeNew Jersey 7.5
- 259MedinaOhio 7.5
- 271MasonOhio 7.4
- 271DyersburgTennessee 7.4
- 271Rose HillVirginia 7.4
- 271NapervilleIllinois 7.4
- 271DetroitMichigan 7.4
- 271Shaker HeightsOhio 7.4
- 271LincolnCalifornia 7.4
- 271OrcuttCalifornia 7.4
- 279New OrleansLouisiana 7.3
- 279AdaOklahoma 7.3
- 279Ponca CityOklahoma 7.3
- 279ChesterPennsylvania 7.3
- 279Cleveland HeightsOhio 7.3
- 279HartfordConnecticut 7.3
- 279JolietIllinois 7.3
- 279NorthbrookIllinois 7.3
- 279Lexingtonlow-cost sensorsMassachusetts 7.3
- 279PortlandMaine 7.3
- 279Grand RapidsMichigan 7.3
- 279HermitagePennsylvania 7.3
- 279NorristownPennsylvania 7.3
- 279FolsomCalifornia 7.3
- 279PleasantonCalifornia 7.3
- 279Spanish ForkUtah 7.3
- 295Fort SmithArkansas 7.2
- 295KennerLouisiana 7.2
- 295GreenvilleNorth Carolina 7.2
- 295YorkPennsylvania 7.2
- 295SpringfieldVirginia 7.2
- 295AnkenyIowa 7.2
- 295EriePennsylvania 7.2
- 302DoverDelaware 7.1
- 302DecaturIllinois 7.1
- 302LafayetteIndiana 7.1
- 302Lincoln ParkMichigan 7.1
- 306VeniceFlorida 7.0
- 306DerbyKansas 7.0
- 306ConwaySouth Carolina 7.0
- 306RichmondVirginia 7.0
- 306ChampaignIllinois 7.0
- 306ChicagoIllinois 7.0
- 306Michigan CityIndiana 7.0
- 306PortageIndiana 7.0
- 306BethlehemPennsylvania 7.0
- 306State CollegePennsylvania 7.0
- 306RutlandVermont 7.0
- 306Santa BarbaraCalifornia 7.0
- 306Las VegasNevada 7.0
- 306AmarilloTexas 7.0
- 320PaducahKentucky 6.9
- 320New AlbanyIndiana 6.9
- 320AshlandKentucky 6.9
- 320Fort ThomasKentucky 6.9
- 320Lexington-FayetteKentucky 6.9
- 320BaltimoreMaryland 6.9
- 320South LaurelMaryland 6.9
- 320East HamptonVirginia 6.9
- 320Calumet CityIllinois 6.9
- 320HammondIndiana 6.9
- 320South BendIndiana 6.9
- 320RochesterNew York 6.9
- 320CarlislePennsylvania 6.9
- 320BridgeportConnecticut 6.9
- 320Redwood CityCalifornia 6.9
- 320HerrimanUtah 6.9
- 320HighlandUtah 6.9
- 337BearDelaware 6.8
- 337Belle GladeFlorida 6.8
- 337WaterburyConnecticut 6.8
- 337Des PlainesIllinois 6.8
- 337EastpointeMichigan 6.8
- 337ReadingPennsylvania 6.8
- 337NogalesArizona 6.8
- 337LubbockTexas 6.8
- 337Great FallsMontana 6.8
- 346WilmingtonDelaware 6.7
- 346Lake MaryFlorida 6.7
- 346EdgewoodMaryland 6.7
- 346ChesapeakeVirginia 6.7
- 346New LondonConnecticut 6.7
- 346BostonMassachusetts 6.7
- 346LancasterPennsylvania 6.7
- 346ChicoCalifornia 6.7
- 354Coconut CreekFlorida 6.6
- 354SpringfieldIllinois 6.6
- 354Kansas CityKansas 6.6
- 354OlatheKansas 6.6
- 354Atlantic CityNew Jersey 6.6
- 354ElkhartIndiana 6.6
- 354AugustaMaine 6.6
- 354PortsmouthNew Hampshire 6.6
- 354AltoonaPennsylvania 6.6
- 354TempeArizona 6.6
- 354TucsonArizona 6.6
- 354DavisCalifornia 6.6
- 354BountifulUtah 6.6
- 354Salt Lake CityUtah 6.6
- 368HomesteadFlorida 6.5
- 368SavannahGeorgia 6.5
- 368University CityMissouri 6.5
- 368South VinelandNew Jersey 6.5
- 368PeoriaIllinois 6.5
- 368SpringfieldMassachusetts 6.5
- 368Bay CityMichigan 6.5
- 368LansingMichigan 6.5
- 368RochesterMinnesota 6.5
- 368PhoenixArizona 6.5
- 368MercedCalifornia 6.5
- 368TracyCalifornia 6.5
- 380LakelandFlorida 6.4
- 380ArnoldMissouri 6.4
- 380PascagoulaMississippi 6.4
- 380AndersonIndiana 6.4
- 380BrocktonMassachusetts 6.4
- 380PittsfieldMassachusetts 6.4
- 380Port HuronMichigan 6.4
- 380KenmoreNew York 6.4
- 380MesaArizona 6.4
- 380Las CrucesNew Mexico 6.4
- 380Spring ValleyNevada 6.4
- 391Delray BeachFlorida 6.3
- 391GainesvilleFlorida 6.3
- 391GulfportMississippi 6.3
- 391RockfordIllinois 6.3
- 391East ChicagoIndiana 6.3
- 391KokomoIndiana 6.3
- 391NewburghNew York 6.3
- 391PainesvilleOhio 6.3
- 391PawtucketRhode Island 6.3
- 391MilwaukeeWisconsin 6.3
- 391MaranaArizona 6.3
- 391RexburgIdaho 6.3
- 403ValricoFlorida 6.2
- 403TopekaKansas 6.2
- 403Kansas CityMissouri 6.2
- 403HopewellVirginia 6.2
- 403JenisonMichigan 6.2
- 403LancasterCalifornia 6.2
- 403Cedar CityUtah 6.2
- 403PocatelloIdaho 6.2
- 403North OgdenUtah 6.2
- 412Upper AltonIllinois 6.1
- 412LemayMissouri 6.1
- 412LawtonOklahoma 6.1
- 412New HavenConnecticut 6.1
- 412Iowa CityIowa 6.1
- 412DerryNew Hampshire 6.1
- 412HolbrookNew York 6.1
- 412LompocCalifornia 6.1
- 412West Valley CityUtah 6.1
- 421DavieFlorida 6.0
- 421Deerfield BeachFlorida 6.0
- 421BrunswickGeorgia 6.0
- 421ClintonIowa 6.0
- 421LowellMassachusetts 6.0
- 421WorcesterMassachusetts 6.0
- 421KeeneNew Hampshire 6.0
- 421GlendaleArizona 6.0
- 421Seasidelow-cost sensorsCalifornia 6.0
- 421AlbuquerqueNew Mexico 6.0
- 421MagnaUtah 6.0
- 432Ferry PassFlorida 5.9
- 432JacksonvilleFlorida 5.9
- 432BloomingtonIndiana 5.9
- 432RaymoreMissouri 5.9
- 432BloomingtonIllinois 5.9
- 432LynnMassachusetts 5.9
- 432GahannaOhio 5.9
- 432Carson CityNevada 5.9
- 432LongmontColorado 5.9
- 441TampaFlorida 5.8
- 441ElktonMaryland 5.8
- 441MuscatineIowa 5.8
- 441WaterlooIowa 5.8
- 441YpsilantiMichigan 5.8
- 441BurnsvilleMinnesota 5.8
- 441SyracuseNew York 5.8
- 441White PlainsNew York 5.8
- 441CoventryRhode Island 5.8
- 441Watsonvillelow-cost sensorsCalifornia 5.8
- 441ReddingCalifornia 5.8
- 452SarasotaFlorida 5.7
- 452West PensacolaFlorida 5.7
- 452DavenportIowa 5.7
- 452GreenfieldMassachusetts 5.7
- 452North ChicopeeMassachusetts 5.7
- 452New CityNew York 5.7
- 452Casas AdobesArizona 5.7
- 452ParadiseCalifornia 5.7
- 452Colorado SpringsColorado 5.7
- 452Columbia CityWashington 5.7
- 462Palm CityFlorida 5.6
- 462Des MoinesIowa 5.6
- 462Fall RiverMassachusetts 5.6
- 462QuincyMassachusetts 5.6
- 462ProvidenceRhode Island 5.6
- 462BillingsMontana 5.6
- 462Rapid CitySouth Dakota 5.6
- 469Fruit CoveFlorida 5.5
- 469Winter ParkFlorida 5.5
- 469UticaNew York 5.5
- 469WatertownSouth Dakota 5.5
- 469DenverColorado 5.5
- 469ThorntonColorado 5.5
- 469HendersonNevada 5.5
- 469Summerlin SouthNevada 5.5
- 477Daytona BeachFlorida 5.4
- 477Oak LawnIllinois 5.4
- 477LewistonMaine 5.4
- 477South MilwaukeeWisconsin 5.4
- 477San Luis ObispoCalifornia 5.4
- 482LibertyMissouri 5.3
- 482MolineIllinois 5.3
- 482EnterpriseNevada 5.3
- 482MoscowIdaho 5.3
- 486WellingtonFlorida 5.2
- 486BangorMaine 5.2
- 488MadisonWisconsin 5.1
- 488WaukeshaWisconsin 5.1
- 488AtascaderoCalifornia 5.1
- 488Boulder CityNevada 5.1
- 488HurricaneUtah 5.1
- 488GilletteWyoming 5.1
- 488Makakilo / Kapolei / Honokai HaleHawaii 5.1
- 495ZionIllinois 5.0
- 495LaconiaNew Hampshire 5.0
- 495Green BayWisconsin 5.0
- 495TacomaWashington 5.0
- 499HagerstownMaryland 4.9
- 499OmahaNebraska 4.9
- 499RenoNevada 4.9
- 499Fort CollinsColorado 4.9
- 499GreeleyColorado 4.9
- 499RentonWashington 4.9
- 505Saint PaulMinnesota 4.8
- 505LittletonColorado 4.8
- 505Apache JunctionArizona 4.8
- 508Safety HarborFlorida 4.7
- 508MinneapolisMinnesota 4.7
- 508ShakopeeMinnesota 4.7
- 508MesquiteNevada 4.7
- 508CondaIdaho 4.7
- 508LewistonIdaho 4.7
- 508KahuluiHawaii 4.7
- 515Palm BayFlorida 4.6
- 515PuebloColorado 4.6
- 515Rio RanchoNew Mexico 4.6
- 515MeridianIdaho 4.6
- 515BozemanMontana 4.6
- 515SeattleWashington 4.6
- 515Rock SpringsWyoming 4.6
- 522WestonFlorida 4.5
- 522Dodge CityKansas 4.5
- 522Idaho FallsIdaho 4.5
- 522AnacortesWashington 4.5
- 522WenatcheeWashington 4.5
- 527AppletonWisconsin 4.4
- 527Elk Grovelow-cost sensorsCalifornia 4.4
- 527TruckeeCalifornia 4.4
- 527VacavilleCalifornia 4.4
- 527Ken CarylColorado 4.4
- 527AnchorageAlaska 4.4
- 533Apple ValleyMinnesota 4.3
- 534BlaineMinnesota 4.2
- 534Saint MichaelMinnesota 4.2
- 534BayonneNew Jersey 4.2
- 534Eau ClaireWisconsin 4.2
- 534SuperiorWisconsin 4.2
- 539Saint CloudMinnesota 4.1
- 539TigardOregon 4.1
- 539BellinghamWashington 4.1
- 539SpokaneWashington 4.1
- 539SunnysideWashington 4.1
- 544MarquetteMichigan 4.0
- 544LincolnNebraska 4.0
- 544NampaIdaho 4.0
- 544ButteMontana 4.0
- 544AuburnWashington 4.0
- 549Port AngelesWashington 3.9
- 549Spokane ValleyWashington 3.9
- 549CasperWyoming 3.9
- 549HonoluluHawaii 3.9
- 553DuluthMinnesota 3.8
- 553Green ValleyArizona 3.8
- 553Spanish SpringsNevada 3.8
- 553Coeur d'AleneIdaho 3.8
- 553RedmondOregon 3.8
- 553EllensburgWashington 3.8
- 553YakimaWashington 3.8
- 560EugeneOregon 3.6
- 560Salmon CreekWashington 3.6
- 562HiloHawaii 3.5
- 563BrookingsSouth Dakota 3.4
- 563MedfordOregon 3.4
- 563The DallesOregon 3.4
- 563Moses LakeWashington 3.4
- 567BismarckNorth Dakota 3.3
- 567AshlandOregon 3.3
- 567Coos BayOregon 3.3
- 567HermistonOregon 3.3
- 567MilwaukieOregon 3.3
- 567CheyenneWyoming 3.3
- 567SheridanWyoming 3.3
- 574BendOregon 3.2
- 574CanbyOregon 3.2
- 574GreshamOregon 3.2
- 574BremertonWashington 3.2
- 574Oak HarborWashington 3.2
- 574ParklandWashington 3.2
- 574ShorelineWashington 3.2
- 574KīheiHawaii 3.2
- 582West FargoNorth Dakota 3.1
- 582BoiseIdaho 3.1
- 584Grand JunctionColorado 3.0
- 585AlbanyOregon 2.9
- 585AltamontOregon 2.9
- 585HillsboroOregon 2.9
- 585CentraliaWashington 2.9
- 585LaceyWashington 2.9
- 585Walla WallaWashington 2.9
- 585LaramieWyoming 2.9
- 592Grants PassOregon 2.8
- 592VancouverWashington 2.8
- 594PortlandOregon 2.7
- 594SalemOregon 2.7
- 594Mount VernonWashington 2.7
- 597Florinlow-cost sensorsCalifornia 2.6
- 597AberdeenWashington 2.6
- 597LongviewWashington 2.6
- 597PullmanWashington 2.6
- 601PendletonOregon 2.5
- 602MissoulaMontana 2.4
- 602BeavertonOregon 2.4
- 602WoodburnOregon 2.4
- 605CorvallisOregon 2.3
- 606AberdeenSouth Dakota 2.2
- 606Forest GroveOregon 2.2
- 608Tri-CitiesWashington 2.1
- 609DallasOregon 2.0
- 609McMinnvilleOregon 2.0
- 611Sioux FallsSouth Dakota 1.8
- 612BellevueWashington 1.7
- 613PascoWashington 1.5
- 614IssaquahWashington 1.2
- 614OrchardsWashington 1.2
- 616MarysvilleWashington 1.1
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+