SmogRank / Countries / United States / January 2025
Most polluted cities in United States, January 2025
633 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Badger at 24.6 µg/m³, #93 of 1,937 cities in the world. Cleanest: Laramie at 1.9. A city needs measurements on 70% of the days to be ranked.
- 1BadgerAlaska 24.6
- 2FresnoCalifornia 23.8
- 3HanfordCalifornia 23.7
- 4ComptonCalifornia 21.4
- 5VisaliaCalifornia 20.7
- 6PhoenixArizona 20.5
- 7Hawthornelow-cost sensorsCalifornia 20.4
- 8Los AngelesCalifornia 20.3
- 9NogalesArizona 19.8
- 10BakersfieldCalifornia 19.4
- 11CorcoranCalifornia 19.1
- 12Carsonlow-cost sensorsCalifornia 19.0
- 13ClovisCalifornia 17.3
- 14Long BeachCalifornia 17.1
- 14Torrancelow-cost sensorsCalifornia 17.1
- 16StocktonCalifornia 16.7
- 17Jurupa ValleyCalifornia 16.1
- 18ModestoCalifornia 16.0
- 19Inglewoodlow-cost sensorsCalifornia 15.6
- 20PortervilleCalifornia 15.5
- 21ParklandWashington 15.4
- 22BurbankCalifornia 15.2
- 22MantecaCalifornia 15.2
- 24MaderaCalifornia 15.1
- 24TurlockCalifornia 15.1
- 24MedfordOregon 15.1
- 27MercedCalifornia 14.8
- 28MesaArizona 14.1
- 29FairbanksAlaska 14.0
- 29Arden-ArcadeCalifornia 14.0
- 31BirminghamAlabama 13.8
- 31UkiahCalifornia 13.8
- 33WoodlandCalifornia 13.5
- 34AugustaGeorgia 13.3
- 34CalexicoCalifornia 13.3
- 36Grants PassOregon 13.2
- 37RentonWashington 13.1
- 38AnaheimCalifornia 13.0
- 38SocorroTexas 13.0
- 38AltamontOregon 13.0
- 38YakimaWashington 13.0
- 42Lomitalow-cost sensorsCalifornia 12.9
- 42HelenaMontana 12.9
- 44SacramentoCalifornia 12.8
- 44La Crescenta-Montroselow-cost sensorsCalifornia 12.8
- 46RedfordMichigan 12.6
- 46Chula VistaCalifornia 12.6
- 48TempeArizona 12.5
- 48Yuba CityCalifornia 12.5
- 50RiversideCalifornia 12.4
- 50TacomaWashington 12.4
- 52GlendaleArizona 12.3
- 53MaranaArizona 12.2
- 54TucsonArizona 12.0
- 54RosevilleCalifornia 12.0
- 54AuburnWashington 12.0
- 57ValdostaGeorgia 11.9
- 57Santa Monicalow-cost sensorsCalifornia 11.9
- 59Casa GrandeArizona 11.7
- 60BerkeleyCalifornia 11.6
- 61San JoseCalifornia 11.5
- 62West MemphisArkansas 11.4
- 62FontanaCalifornia 11.4
- 62SpokaneWashington 11.4
- 62Spokane ValleyWashington 11.4
- 66East RidgeTennessee 11.3
- 66BensalemPennsylvania 11.3
- 66San DiegoCalifornia 11.3
- 69Little RockArkansas 11.2
- 70HoustonTexas 11.1
- 70LancasterPennsylvania 11.1
- 72El CajonCalifornia 11.0
- 73VallejoCalifornia 10.9
- 73Columbia CityWashington 10.9
- 73LaceyWashington 10.9
- 76Santa BarbaraCalifornia 10.8
- 76Rio RanchoNew Mexico 10.8
- 76Las VegasNevada 10.8
- 76LewistonIdaho 10.8
- 76OremUtah 10.8
- 81PhiladelphiaPennsylvania 10.6
- 81SalemOregon 10.6
- 83BrunswickGeorgia 10.5
- 83New AlbanyIndiana 10.5
- 83ChesterPennsylvania 10.5
- 83LincolnCalifornia 10.5
- 83EugeneOregon 10.5
- 83MillcreekUtah 10.5
- 89ReadingPennsylvania 10.4
- 89Port AngelesWashington 10.4
- 91MiddletownOhio 10.3
- 91Port ArthurTexas 10.3
- 91HarrisburgPennsylvania 10.3
- 91AtascaderoCalifornia 10.3
- 95MaconGeorgia 10.2
- 95ToledoOhio 10.2
- 95LebanonPennsylvania 10.2
- 95PawtucketRhode Island 10.2
- 95BozemanMontana 10.2
- 100GahannaOhio 10.1
- 100OregonOhio 10.1
- 100CarlislePennsylvania 10.1
- 100West MifflinPennsylvania 10.1
- 100Casas AdobesArizona 10.1
- 100Great FallsMontana 10.1
- 100SunnysideWashington 10.1
- 107GreenvilleSouth Carolina 10.0
- 107DublinOhio 10.0
- 107MartinezCalifornia 10.0
- 110LexingtonNorth Carolina 9.9
- 110FolsomCalifornia 9.9
- 110GaltCalifornia 9.9
- 110Santa CruzCalifornia 9.9
- 110RenoNevada 9.9
- 115OaklandCalifornia 9.8
- 115HermistonOregon 9.8
- 115LongviewWashington 9.8
- 118WilmingtonDelaware 9.7
- 118AlbanyGeorgia 9.7
- 118Hunt ValleyMaryland 9.7
- 118SteubenvilleOhio 9.7
- 118WoodburnOregon 9.7
- 123NorwoodOhio 9.6
- 123Missouri CityTexas 9.6
- 123GaryIndiana 9.6
- 123ButteMontana 9.6
- 123CentraliaWashington 9.6
- 123SeattleWashington 9.6
- 129Agouralow-cost sensorsCalifornia 9.5
- 129LivermoreCalifornia 9.5
- 129VictorvilleCalifornia 9.5
- 129AlbuquerqueNew Mexico 9.5
- 133TallahasseeFlorida 9.4
- 133IndianapolisIndiana 9.4
- 133BaltimoreMaryland 9.4
- 133DallasTexas 9.4
- 133ShorelineWashington 9.4
- 138YorkPennsylvania 9.3
- 138WestervilleOhio 9.3
- 138NorristownPennsylvania 9.3
- 138Sunland ParkNew Mexico 9.3
- 142JacksonvilleFlorida 9.2
- 142ColumbusGeorgia 9.2
- 142SavannahGeorgia 9.2
- 142EdgewoodMaryland 9.2
- 146WyomingMichigan 9.1
- 146AlbanyOregon 9.1
- 146HillsboroOregon 9.1
- 146PendletonOregon 9.1
- 146West JordanUtah 9.1
- 151FishersIndiana 9.0
- 151ColumbusOhio 9.0
- 151PasadenaTexas 9.0
- 151BethlehemPennsylvania 9.0
- 151TracyCalifornia 9.0
- 151Carson CityNevada 9.0
- 157OcalaFlorida 8.9
- 157WaterlooIowa 8.9
- 157GreenfieldMassachusetts 8.9
- 157ClevelandOhio 8.9
- 157Santa ClaritaCalifornia 8.9
- 157EllensburgWashington 8.9
- 163SpartanburgSouth Carolina 8.8
- 163ConroeTexas 8.8
- 163AllentownPennsylvania 8.8
- 163YumaArizona 8.8
- 163GlendoraCalifornia 8.8
- 163OceansideCalifornia 8.8
- 163Spanish SpringsNevada 8.8
- 163TigardOregon 8.8
- 171Ponte Vedra BeachFlorida 8.7
- 171EvansvilleIndiana 8.7
- 171JeffersonvilleIndiana 8.7
- 171Terre HauteIndiana 8.7
- 171BellevueNebraska 8.7
- 171WheelingWest Virginia 8.7
- 171VacavilleCalifornia 8.7
- 178LouisvilleKentucky 8.6
- 178ClemmonsNorth Carolina 8.6
- 178White OakOhio 8.6
- 178KnoxvilleTennessee 8.6
- 178Coeur d'AleneIdaho 8.6
- 178MilwaukieOregon 8.6
- 184LawrencevilleGeorgia 8.5
- 184WichitaKansas 8.5
- 184FayettevilleNorth Carolina 8.5
- 184DaytonOhio 8.5
- 184MissionTexas 8.5
- 184Mission BendTexas 8.5
- 184CantonOhio 8.5
- 184WilkinsburgPennsylvania 8.5
- 184Walla WallaWashington 8.5
- 193DoverDelaware 8.4
- 193ColumbusIndiana 8.4
- 193JeffersontownKentucky 8.4
- 193PennsaukenNew Jersey 8.4
- 193LebanonOhio 8.4
- 193PortsmouthOhio 8.4
- 193Fort WorthTexas 8.4
- 193SaginawTexas 8.4
- 193SpringfieldVirginia 8.4
- 193PerrysburgOhio 8.4
- 193Lake ElsinoreCalifornia 8.4
- 193LongmontColorado 8.4
- 193WenatcheeWashington 8.4
- 206NewarkDelaware 8.3
- 206NashvilleTennessee 8.3
- 206Bay CityMichigan 8.3
- 206Shaker HeightsOhio 8.3
- 206WarrenOhio 8.3
- 206PittsburghPennsylvania 8.3
- 206Spanish ForkUtah 8.3
- 213MiamiFlorida 8.2
- 213Valley StationKentucky 8.2
- 213LafayetteLouisiana 8.2
- 213PortlandMaine 8.2
- 213Santa RosaCalifornia 8.2
- 213The DallesOregon 8.2
- 219TampaFlorida 8.1
- 219Lexington-FayetteKentucky 8.1
- 219RockvilleMaryland 8.1
- 219FlorenceSouth Carolina 8.1
- 219HuntingtonWest Virginia 8.1
- 219Fort WayneIndiana 8.1
- 219DetroitMichigan 8.1
- 219Fort LeeNew Jersey 8.1
- 219NewburghNew York 8.1
- 219MedinaOhio 8.1
- 219San FranciscoCalifornia 8.1
- 230BessemerAlabama 8.0
- 230Daytona BeachFlorida 8.0
- 230Warner RobinsGeorgia 8.0
- 230JasperIndiana 8.0
- 230ElktonMaryland 8.0
- 230SewellNew Jersey 8.0
- 230HarrisonburgVirginia 8.0
- 230DearbornMichigan 8.0
- 230UticaNew York 8.0
- 230AkronOhio 8.0
- 230GilroyCalifornia 8.0
- 230OdessaTexas 8.0
- 242BearDelaware 7.9
- 242GainesvilleGeorgia 7.9
- 242HagerstownMaryland 7.9
- 242JacksonMississippi 7.9
- 242South VinelandNew Jersey 7.9
- 242MuscatineIowa 7.9
- 242KeeneNew Hampshire 7.9
- 242BayonneNew Jersey 7.9
- 242EwingNew Jersey 7.9
- 242White PlainsNew York 7.9
- 242JohnstownPennsylvania 7.9
- 242NipomoCalifornia 7.9
- 242Salt Lake CityUtah 7.9
- 242VancouverWashington 7.9
- 256ValricoFlorida 7.8
- 256VeniceFlorida 7.8
- 256CharlotteNorth Carolina 7.8
- 256Winston-SalemNorth Carolina 7.8
- 256CincinnatiOhio 7.8
- 256North CharlestonSouth Carolina 7.8
- 256LindenNew Jersey 7.8
- 256YoungstownOhio 7.8
- 256ScrantonPennsylvania 7.8
- 256WeirtonWest Virginia 7.8
- 256DavisCalifornia 7.8
- 256PortlandOregon 7.8
- 268SpringdaleArkansas 7.7
- 268DecaturIllinois 7.7
- 268AshlandKentucky 7.7
- 268Saint MatthewsKentucky 7.7
- 268McAlesterOklahoma 7.7
- 268ChattanoogaTennessee 7.7
- 268Calumet CityIllinois 7.7
- 268MuncieIndiana 7.7
- 268La VistaNebraska 7.7
- 268New York CityNew York 7.7
- 268McKeesportPennsylvania 7.7
- 268Candler-McAfeeGeorgia 7.7
- 280Fort LauderdaleFlorida 7.6
- 280BloomingtonIndiana 7.6
- 280OwensboroKentucky 7.6
- 280HattiesburgMississippi 7.6
- 280SpringfieldOhio 7.6
- 280BaytownTexas 7.6
- 280ThorntonColorado 7.6
- 287TrussvilleAlabama 7.5
- 287Fort SmithArkansas 7.5
- 287Kansas CityKansas 7.5
- 287DurhamNorth Carolina 7.5
- 287HickoryNorth Carolina 7.5
- 287ChesapeakeVirginia 7.5
- 287WaterburyConnecticut 7.5
- 287Franklin ParkIllinois 7.5
- 287New CityNew York 7.5
- 287IndioCalifornia 7.5
- 287NampaIdaho 7.5
- 287MissoulaMontana 7.5
- 287BellinghamWashington 7.5
- 300AthensGeorgia 7.4
- 300AustinTexas 7.4
- 300DanburyConnecticut 7.4
- 300Elmwood ParkIllinois 7.4
- 300LaconiaNew Hampshire 7.4
- 300TrentonNew Jersey 7.4
- 300LimaOhio 7.4
- 300HermitagePennsylvania 7.4
- 300LompocCalifornia 7.4
- 300DenverColorado 7.4
- 300GreeleyColorado 7.4
- 300BountifulUtah 7.4
- 312HuntsvilleAlabama 7.3
- 312Fruit CoveFlorida 7.3
- 312TopekaKansas 7.3
- 312GreensboroNorth Carolina 7.3
- 312Toms RiverNew Jersey 7.3
- 312ConwaySouth Carolina 7.3
- 312San AntonioTexas 7.3
- 312AugustaMaine 7.3
- 312Lincoln ParkMichigan 7.3
- 312Grand JunctionColorado 7.3
- 312BoiseIdaho 7.3
- 323WashingtonDistrict of Columbia 7.2
- 323South LaurelMaryland 7.2
- 323Oklahoma CityOklahoma 7.2
- 323BrownsvilleTexas 7.2
- 323College StationTexas 7.2
- 323CharlestonWest Virginia 7.2
- 323AndersonIndiana 7.2
- 323East ChicagoIndiana 7.2
- 323KalamazooMichigan 7.2
- 323HolbrookNew York 7.2
- 323PainesvilleOhio 7.2
- 323AltoonaPennsylvania 7.2
- 323ProvidenceRhode Island 7.2
- 323San LeandroCalifornia 7.2
- 337Baton RougeLouisiana 7.1
- 337RaleighNorth Carolina 7.1
- 337TulsaOklahoma 7.1
- 337Rose HillVirginia 7.1
- 337SouthfieldMichigan 7.1
- 337South MilwaukeeWisconsin 7.1
- 337San Luis ObispoCalifornia 7.1
- 337Picnic Point-North LynnwoodWashington 7.1
- 345GadsdenAlabama 7.0
- 345Belle GladeFlorida 7.0
- 345Deerfield BeachFlorida 7.0
- 345Oak RidgeFlorida 7.0
- 345Granite CityIllinois 7.0
- 345ScaggsvilleMaryland 7.0
- 345BartlettTennessee 7.0
- 345Corpus ChristiTexas 7.0
- 345Live OakTexas 7.0
- 345AshburnVirginia 7.0
- 345BangorMaine 7.0
- 345EastpointeMichigan 7.0
- 345RochesterMinnesota 7.0
- 345PatersonNew Jersey 7.0
- 345AlbanyNew York 7.0
- 345State CollegePennsylvania 7.0
- 361HomesteadFlorida 6.9
- 361WellingtonFlorida 6.9
- 361EdinburgTexas 6.9
- 361PeoriaIllinois 6.9
- 361ElkhartIndiana 6.9
- 361TaylorMichigan 6.9
- 361RochesterNew York 6.9
- 361RutlandVermont 6.9
- 361WaukeshaWisconsin 6.9
- 361Weirton HeightsWest Virginia 6.9
- 361PleasantonCalifornia 6.9
- 361ReddingCalifornia 6.9
- 361AshlandOregon 6.9
- 361BeavertonOregon 6.9
- 361MidwayFlorida 6.9
- 376Fort MyersFlorida 6.8
- 376AtlantaGeorgia 6.8
- 376OlatheKansas 6.8
- 376Fort ThomasKentucky 6.8
- 376Saint JosephMissouri 6.8
- 376HendersonvilleTennessee 6.8
- 376BrookingsSouth Dakota 6.8
- 376SheridanWyoming 6.8
- 384DavieFlorida 6.7
- 384SarasotaFlorida 6.7
- 384St. LouisMissouri 6.7
- 384University CityMissouri 6.7
- 384MasonOhio 6.7
- 384HartfordConnecticut 6.7
- 384BrookfieldIllinois 6.7
- 384HammondIndiana 6.7
- 384PortageIndiana 6.7
- 384MilwaukeeWisconsin 6.7
- 384BanningCalifornia 6.7
- 384PowayCalifornia 6.7
- 384Redwood CityCalifornia 6.7
- 384Moses LakeWashington 6.7
- 398Lake MaryFlorida 6.6
- 398MorrisvilleNorth Carolina 6.6
- 398EdmondOklahoma 6.6
- 398RichmondVirginia 6.6
- 398ChicagoIllinois 6.6
- 398Port HuronMichigan 6.6
- 398SalinasCalifornia 6.6
- 398BendOregon 6.6
- 398MagnaUtah 6.6
- 398West Valley CityUtah 6.6
- 408PaducahKentucky 6.5
- 408Palm CityFlorida 6.5
- 408Winter ParkFlorida 6.5
- 408Upper AltonIllinois 6.5
- 408MooreOklahoma 6.5
- 408Cleveland HeightsOhio 6.5
- 408ChampaignIllinois 6.5
- 408JolietIllinois 6.5
- 408South BendIndiana 6.5
- 408YpsilantiMichigan 6.5
- 408BrawleyCalifornia 6.5
- 408ConcordCalifornia 6.5
- 408San RafaelCalifornia 6.5
- 408AnacortesWashington 6.5
- 408BremertonWashington 6.5
- 423East Saint LouisIllinois 6.4
- 423HernandoMississippi 6.4
- 423PascagoulaMississippi 6.4
- 423Ponca CityOklahoma 6.4
- 423CorsicanaTexas 6.4
- 423East HamptonVirginia 6.4
- 423New HavenConnecticut 6.4
- 423ClintonIowa 6.4
- 423Iowa CityIowa 6.4
- 423NapervilleIllinois 6.4
- 423Grand RapidsMichigan 6.4
- 423Jersey CityNew Jersey 6.4
- 423Salmon CreekWashington 6.4
- 436Ferry PassFlorida 6.3
- 436DentonTexas 6.3
- 436TexarkanaTexas 6.3
- 436BloomingtonIllinois 6.3
- 436BostonMassachusetts 6.3
- 436Goletalow-cost sensorsCalifornia 6.3
- 436OxnardCalifornia 6.3
- 436South Lake TahoeCalifornia 6.3
- 436MeridianIdaho 6.3
- 436RoseburgOregon 6.3
- 436Four CornersFlorida 6.3
- 447FairhopeAlabama 6.2
- 447KennerLouisiana 6.2
- 447CaryIllinois 6.2
- 447WorcesterMassachusetts 6.2
- 447BuffaloNew York 6.2
- 447MadisonWisconsin 6.2
- 447BridgeportConnecticut 6.2
- 447Fort CollinsColorado 6.2
- 447Rapid CitySouth Dakota 6.2
- 456PrichardAlabama 6.1
- 456Delray BeachFlorida 6.1
- 456Safety HarborFlorida 6.1
- 456DerbyKansas 6.1
- 456ArnoldMissouri 6.1
- 456AshevilleNorth Carolina 6.1
- 456JenksOklahoma 6.1
- 456Saint AndrewsSouth Carolina 6.1
- 456San MarcosTexas 6.1
- 456KokomoIndiana 6.1
- 456El CentroCalifornia 6.1
- 456Simi ValleyCalifornia 6.1
- 468DecaturAlabama 6.0
- 468West PensacolaFlorida 6.0
- 468LemayMissouri 6.0
- 468ColumbiaTennessee 6.0
- 468KingsportTennessee 6.0
- 468MaryvilleTennessee 6.0
- 468TaylorTexas 6.0
- 468Des PlainesIllinois 6.0
- 468ElginIllinois 6.0
- 468MolineIllinois 6.0
- 468Michigan CityIndiana 6.0
- 468FlintMichigan 6.0
- 468HollandMichigan 6.0
- 468LansingMichigan 6.0
- 468Apache JunctionArizona 6.0
- 468CanbyOregon 6.0
- 468RedmondOregon 6.0
- 468North OgdenUtah 6.0
- 486OrlandoFlorida 5.9
- 486WestonFlorida 5.9
- 486GulfportMississippi 5.9
- 486ClaytonNorth Carolina 5.9
- 486CharlottesvilleVirginia 5.9
- 486New LondonConnecticut 5.9
- 486DavenportIowa 5.9
- 486FraminghamMassachusetts 5.9
- 486EriePennsylvania 5.9
- 486Eau ClaireWisconsin 5.9
- 486GreshamOregon 5.9
- 486McMinnvilleOregon 5.9
- 486HighlandUtah 5.9
- 486Oxon Hill-GlassmanorMaryland 5.9
- 500ChalmetteLouisiana 5.8
- 500SpringfieldMissouri 5.8
- 500Cedar RapidsIowa 5.8
- 500PittsfieldMassachusetts 5.8
- 500Arroyo GrandeCalifornia 5.8
- 500OrcuttCalifornia 5.8
- 506Coconut CreekFlorida 5.7
- 506SulphurLouisiana 5.7
- 506Kansas CityMissouri 5.7
- 506DyersburgTennessee 5.7
- 506GalvestonTexas 5.7
- 506AuroraIllinois 5.7
- 506LowellMassachusetts 5.7
- 506TemeculaCalifornia 5.7
- 506LittletonColorado 5.7
- 506Twin FallsIdaho 5.7
- 516BeltonTexas 5.6
- 516NorthbrookIllinois 5.6
- 516RockfordIllinois 5.6
- 516BrocktonMassachusetts 5.6
- 516SpringfieldMassachusetts 5.6
- 516MankatoMinnesota 5.6
- 516MinneapolisMinnesota 5.6
- 516OmahaNebraska 5.6
- 516Thousand OaksCalifornia 5.6
- 525JacksonTennessee 5.5
- 525La PorteTexas 5.5
- 525HopewellVirginia 5.5
- 525ZionIllinois 5.5
- 525North ChicopeeMassachusetts 5.5
- 525JenisonMichigan 5.5
- 525SyracuseNew York 5.5
- 525DallasOregon 5.5
- 525Brigham CityUtah 5.5
- 525AberdeenWashington 5.5
- 535MontgomeryAlabama 5.4
- 535GainesvilleFlorida 5.4
- 535Palm BayFlorida 5.4
- 535McDonoughGeorgia 5.4
- 535LawtonOklahoma 5.4
- 535ClarksvilleTennessee 5.4
- 535LafayetteIndiana 5.4
- 535HaverhillMassachusetts 5.4
- 535MilfordMassachusetts 5.4
- 535BurnsvilleMinnesota 5.4
- 535AppletonWisconsin 5.4
- 535HendersonNevada 5.4
- 535Idaho FallsIdaho 5.4
- 535Forest GroveOregon 5.4
- 535HerrimanUtah 5.4
- 535RandolphNew Jersey 5.4
- 551SpringfieldIllinois 5.3
- 551RoanokeVirginia 5.3
- 551Fall RiverMassachusetts 5.3
- 551Saint PaulMinnesota 5.3
- 551Green BayWisconsin 5.3
- 551Green ValleyArizona 5.3
- 557GreenvilleNorth Carolina 5.2
- 557CookevilleTennessee 5.2
- 557ElizabethNew Jersey 5.2
- 557New BrunswickNew Jersey 5.2
- 557BillingsMontana 5.2
- 562LewistonMaine 5.1
- 562ShakopeeMinnesota 5.1
- 562LancasterCalifornia 5.1
- 562Coos BayOregon 5.1
- 562AnchorageAlaska 5.1
- 567New OrleansLouisiana 5.0
- 567LibertyMissouri 5.0
- 567Roanoke RapidsNorth Carolina 5.0
- 567QuincyMassachusetts 5.0
- 567LincolnNebraska 5.0
- 567HollisterCalifornia 5.0
- 567PuebloColorado 5.0
- 567Spring ValleyNevada 5.0
- 575RaymoreMissouri 4.9
- 575BlaineMinnesota 4.9
- 575ParadiseCalifornia 4.9
- 575Colorado SpringsColorado 4.9
- 579LaredoTexas 4.8
- 579Saint MichaelMinnesota 4.8
- 579PortsmouthNew Hampshire 4.8
- 579AberdeenSouth Dakota 4.8
- 579BellevueWashington 4.8
- 584Des MoinesIowa 4.7
- 584LynnMassachusetts 4.7
- 584DerryNew Hampshire 4.7
- 584EnterpriseNevada 4.7
- 584HonoluluHawaii 4.7
- 589PleasantvilleNew Jersey 4.6
- 589Apple ValleyMinnesota 4.6
- 589Saint CloudMinnesota 4.6
- 589KahuluiHawaii 4.6
- 589Makakilo / Kapolei / Honokai HaleHawaii 4.6
- 594AnkenyIowa 4.5
- 594HobbsNew Mexico 4.5
- 596Bonita SpringsFlorida 4.4
- 596Atlantic CityNew Jersey 4.4
- 596CorvallisOregon 4.4
- 599SuperiorWisconsin 4.3
- 599BoulderColorado 4.3
- 601Ken CarylColorado 4.2
- 601Las CrucesNew Mexico 4.2
- 601MoscowIdaho 4.2
- 601TooeleUtah 4.2
- 601KīheiHawaii 4.2
- 606Cedar CityUtah 4.1
- 607DuluthMinnesota 4.0
- 607Dodge CityKansas 4.0
- 607BismarckNorth Dakota 4.0
- 607Summerlin SouthNevada 4.0
- 611Eagle PassTexas 3.9
- 611HurricaneUtah 3.9
- 611HiloHawaii 3.9
- 614ShreveportLouisiana 3.8
- 614MesquiteNevada 3.8
- 616CoventryRhode Island 3.7
- 616Cañon CityColorado 3.7
- 618PullmanWashington 3.6
- 619LubbockTexas 3.5
- 619Tri-CitiesWashington 3.5
- 621TruckeeCalifornia 3.4
- 621Rock SpringsWyoming 3.4
- 623West FargoNorth Dakota 3.3
- 624GilletteWyoming 3.1
- 625Mount VernonWashington 3.0
- 626Boulder CityNevada 2.9
- 627Sioux FallsSouth Dakota 2.8
- 628RidgecrestCalifornia 2.7
- 628Oak HarborWashington 2.7
- 628CheyenneWyoming 2.7
- 631MarquetteMichigan 2.4
- 632CasperWyoming 2.3
- 633LaramieWyoming 1.9
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+