SmogRank / Countries / United States / October 2025
Most polluted cities in United States, October 2025
672 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Tulare at 20.8 µg/m³, #205 of 2,110 cities in the world. Cleanest: Parker at 0.2. A city needs measurements on 70% of the days to be ranked.
- 1Tularelow-cost sensorsCalifornia 20.8
- 2WenatcheeWashington 20.6
- 3BaytownTexas 15.8
- 4BakersfieldCalifornia 15.2
- 5RiversideCalifornia 14.2
- 6Jurupa ValleyCalifornia 13.1
- 7VisaliaCalifornia 12.8
- 8CorcoranCalifornia 12.7
- 9HanfordCalifornia 12.6
- 10HoustonTexas 11.8
- 11FontanaCalifornia 11.7
- 12Los AngelesCalifornia 11.5
- 13PortervilleCalifornia 11.4
- 14NogalesArizona 11.1
- 15Little RockArkansas 10.9
- 15Santa Monicalow-cost sensorsCalifornia 10.9
- 17Columbialow-cost sensorsMissouri 10.8
- 18FresnoCalifornia 10.6
- 19BerkeleyCalifornia 10.4
- 19YakimaWashington 10.4
- 21ComptonCalifornia 10.2
- 21San DiegoCalifornia 10.2
- 23LaredoTexas 10.0
- 24Hawthornelow-cost sensorsCalifornia 9.9
- 25AnaheimCalifornia 9.8
- 26YumaArizona 9.7
- 26GlendoraCalifornia 9.7
- 28Baton RougeLouisiana 9.6
- 29HattiesburgMississippi 9.5
- 29PasadenaTexas 9.5
- 31DallasTexas 9.4
- 31Des MoinesIowa 9.4
- 31CalexicoCalifornia 9.4
- 31ModestoCalifornia 9.4
- 31Torrancelow-cost sensorsCalifornia 9.4
- 36MooreOklahoma 9.3
- 37WyomingMichigan 9.2
- 37Inglewoodlow-cost sensorsCalifornia 9.2
- 39SulphurLouisiana 9.1
- 39Carsonlow-cost sensorsCalifornia 9.1
- 41SpringdaleArkansas 9.0
- 41Fort WorthTexas 9.0
- 41BurbankCalifornia 9.0
- 41Long BeachCalifornia 9.0
- 45TallahasseeFlorida 8.9
- 45SaginawTexas 8.9
- 45Wheatonlow-cost sensorsIllinois 8.9
- 45MaderaCalifornia 8.9
- 45El PasoTexas 8.9
- 50LafayetteLouisiana 8.8
- 50Missouri CityTexas 8.8
- 50TexarkanaTexas 8.8
- 50BrookingsSouth Dakota 8.8
- 50OxnardCalifornia 8.8
- 50Eagle PassTexas 8.8
- 56JacksonMississippi 8.7
- 56DentonTexas 8.7
- 56Fort DodgeIowa 8.7
- 56Pasadenalow-cost sensorsCalifornia 8.7
- 60WichitaKansas 8.6
- 60ShreveportLouisiana 8.6
- 60TulsaOklahoma 8.6
- 60Port ArthurTexas 8.6
- 64LexingtonNorth Carolina 8.5
- 64Mission BendTexas 8.5
- 66East Saint LouisIllinois 8.4
- 66OwensboroKentucky 8.4
- 66Royal Oaklow-cost sensorsMichigan 8.4
- 69St. LouisMissouri 8.3
- 69McAlesterOklahoma 8.3
- 69AustinTexas 8.3
- 69WoodlandCalifornia 8.3
- 73Saint JosephMissouri 8.2
- 73GulfportMississippi 8.2
- 73GaryIndiana 8.2
- 73El CajonCalifornia 8.2
- 73OceansideCalifornia 8.2
- 73AlbanyOregon 8.2
- 79Granite CityIllinois 8.1
- 79Oklahoma CityOklahoma 8.1
- 79EdinburgTexas 8.1
- 79San AntonioTexas 8.1
- 79PhoenixArizona 8.1
- 79RichmondCalifornia 8.1
- 85ValdostaGeorgia 8.0
- 85Terre HauteIndiana 8.0
- 85MiddletownOhio 8.0
- 85RedfordMichigan 8.0
- 85StocktonCalifornia 8.0
- 90San JoseCalifornia 7.9
- 90VictorvilleCalifornia 7.9
- 90Picnic Point-North LynnwoodWashington 7.9
- 93West MemphisArkansas 7.8
- 93MaconGeorgia 7.8
- 93BeltonTexas 7.8
- 93MissionTexas 7.8
- 93Iowa CityIowa 7.8
- 93BrookfieldIllinois 7.8
- 93PowayCalifornia 7.8
- 100TopekaKansas 7.7
- 100ColumbusOhio 7.7
- 100Corpus ChristiTexas 7.7
- 100TurlockCalifornia 7.7
- 100Great FallsMontana 7.7
- 105Upper AltonIllinois 7.6
- 105IndianapolisIndiana 7.6
- 105Kansas CityKansas 7.6
- 105OlatheKansas 7.6
- 105PortsmouthOhio 7.6
- 105EdmondOklahoma 7.6
- 105MankatoMinnesota 7.6
- 105NampaIdaho 7.6
- 105MillcreekUtah 7.6
- 105AnchorageAlaska 7.6
- 115JenksOklahoma 7.5
- 115BrownsvilleTexas 7.5
- 115CorsicanaTexas 7.5
- 115Cedar RapidsIowa 7.5
- 115Lake ElsinoreCalifornia 7.5
- 115MoscowIdaho 7.5
- 115MidwayFlorida 7.5
- 122KennerLouisiana 7.4
- 122PeoriaIllinois 7.4
- 122Agouralow-cost sensorsCalifornia 7.4
- 122Columbia CityWashington 7.4
- 126MontgomeryAlabama 7.3
- 126JeffersonvilleIndiana 7.3
- 126College StationTexas 7.3
- 126Lomitalow-cost sensorsCalifornia 7.3
- 126Santa ClaritaCalifornia 7.3
- 126AnacortesWashington 7.3
- 132Hunt ValleyMaryland 7.2
- 132WaterlooIowa 7.2
- 132HollandMichigan 7.2
- 132Sioux FallsSouth Dakota 7.2
- 132MercedCalifornia 7.2
- 132San FranciscoCalifornia 7.2
- 132SunnysideWashington 7.2
- 139OcalaFlorida 7.1
- 139PascagoulaMississippi 7.1
- 139LawtonOklahoma 7.1
- 139MolineIllinois 7.1
- 143BirminghamAlabama 7.0
- 143DerbyKansas 7.0
- 143NorwoodOhio 7.0
- 143Ponca CityOklahoma 7.0
- 143La PorteTexas 7.0
- 143Live OakTexas 7.0
- 143BridgeviewIllinois 7.0
- 143ChicagoIllinois 7.0
- 143ElginIllinois 7.0
- 143Franklin ParkIllinois 7.0
- 143Simi ValleyCalifornia 7.0
- 143VallejoCalifornia 7.0
- 143Coeur d'AleneIdaho 7.0
- 143SeattleWashington 7.0
- 157Kansas CityMissouri 6.9
- 157Des PlainesIllinois 6.9
- 157Elmwood ParkIllinois 6.9
- 157PaysonArizona 6.9
- 157GreeleyColorado 6.9
- 157HillsboroOregon 6.9
- 163Ferry PassFlorida 6.8
- 163Ponte Vedra BeachFlorida 6.8
- 163VeniceFlorida 6.8
- 163LawrencevilleGeorgia 6.8
- 163CincinnatiOhio 6.8
- 163AnkenyIowa 6.8
- 163RochesterMinnesota 6.8
- 163WestervilleOhio 6.8
- 163BrawleyCalifornia 6.8
- 163LewistonIdaho 6.8
- 163TigardOregon 6.8
- 174AtlantaGeorgia 6.7
- 174New AlbanyIndiana 6.7
- 174SpringfieldMissouri 6.7
- 174ClintonIowa 6.7
- 174DavenportIowa 6.7
- 174LafayetteIndiana 6.7
- 174KalamazooMichigan 6.7
- 174MinneapolisMinnesota 6.7
- 174EwingNew Jersey 6.7
- 174FlagstaffArizona 6.7
- 174ClovisCalifornia 6.7
- 174MantecaCalifornia 6.7
- 174San LeandroCalifornia 6.7
- 174RenoNevada 6.7
- 174SocorroTexas 6.7
- 189DecaturIllinois 6.6
- 189SpringfieldIllinois 6.6
- 189LouisvilleKentucky 6.6
- 189YorkPennsylvania 6.6
- 189Cedar ParkTexas 6.6
- 189DoltonIllinois 6.6
- 189OmahaNebraska 6.6
- 189Arroyo GrandeCalifornia 6.6
- 189Mission ViejoCalifornia 6.6
- 189RexburgIdaho 6.6
- 199AugustaGeorgia 6.5
- 199SavannahGeorgia 6.5
- 199ShakopeeMinnesota 6.5
- 199TempeArizona 6.5
- 199Santa BarbaraCalifornia 6.5
- 199Thousand OaksCalifornia 6.5
- 199VancouverWashington 6.5
- 206West PensacolaFlorida 6.4
- 206EvansvilleIndiana 6.4
- 206ChalmetteLouisiana 6.4
- 206ArnoldMissouri 6.4
- 206GalvestonTexas 6.4
- 206ElkhartIndiana 6.4
- 206BurnsvilleMinnesota 6.4
- 206Saint PaulMinnesota 6.4
- 206TucsonArizona 6.4
- 206RosevilleCalifornia 6.4
- 206OdessaTexas 6.4
- 206AuburnWashington 6.4
- 206La Crescenta-Montroselow-cost sensorsCalifornia 6.4
- 219JacksonvilleFlorida 6.3
- 219Valley StationKentucky 6.3
- 219HernandoMississippi 6.3
- 219DaytonOhio 6.3
- 219BartlettTennessee 6.3
- 219MuscatineIowa 6.3
- 219RockfordIllinois 6.3
- 219HammondIndiana 6.3
- 219DetroitMichigan 6.3
- 219CantonOhio 6.3
- 219Florinlow-cost sensorsCalifornia 6.3
- 219SacramentoCalifornia 6.3
- 219ThorntonColorado 6.3
- 219Fort CollinsColorado 6.3
- 219HighlandUtah 6.3
- 219West JordanUtah 6.3
- 219SpokaneWashington 6.3
- 236FairhopeAlabama 6.2
- 236Kendale LakesFlorida 6.2
- 236Warner RobinsGeorgia 6.2
- 236New OrleansLouisiana 6.2
- 236University CityMissouri 6.2
- 236Atlantic CityNew Jersey 6.2
- 236NashvilleTennessee 6.2
- 236Calumet CityIllinois 6.2
- 236Fort WayneIndiana 6.2
- 236AlbanyNew York 6.2
- 236Casa GrandeArizona 6.2
- 236OaklandCalifornia 6.2
- 236San Luis ObispoCalifornia 6.2
- 236UkiahCalifornia 6.2
- 236Las VegasNevada 6.2
- 236MedfordOregon 6.2
- 236West Valley CityUtah 6.2
- 253AlbanyGeorgia 6.1
- 253BloomingtonIllinois 6.1
- 253JolietIllinois 6.1
- 253Oak LawnIllinois 6.1
- 253DearbornMichigan 6.1
- 253West FargoNorth Dakota 6.1
- 253LindenNew Jersey 6.1
- 253ClevelandOhio 6.1
- 253LimaOhio 6.1
- 253SteubenvilleOhio 6.1
- 253LincolnCalifornia 6.1
- 253Oregon CityOregon 6.1
- 265GadsdenAlabama 6.0
- 265LemayMissouri 6.0
- 265CharlotteNorth Carolina 6.0
- 265San MarcosTexas 6.0
- 265AuroraIllinois 6.0
- 265NapervilleIllinois 6.0
- 265MuncieIndiana 6.0
- 265Grand RapidsMichigan 6.0
- 265DuluthMinnesota 6.0
- 265OregonOhio 6.0
- 265WarrenOhio 6.0
- 265GlendaleArizona 6.0
- 265ChicoCalifornia 6.0
- 265NipomoCalifornia 6.0
- 265South San Franciscolow-cost sensorsCalifornia 6.0
- 265CanbyOregon 6.0
- 265EllensburgWashington 6.0
- 282BessemerAlabama 5.9
- 282PrichardAlabama 5.9
- 282Bonita SpringsFlorida 5.9
- 282Daytona BeachFlorida 5.9
- 282BrunswickGeorgia 5.9
- 282LeawoodKansas 5.9
- 282Camdenlow-cost sensorsNew Jersey 5.9
- 282FlorenceSouth Carolina 5.9
- 282BellevueNebraska 5.9
- 282PerrysburgOhio 5.9
- 282MilwaukeeWisconsin 5.9
- 282SuperiorWisconsin 5.9
- 282MesaArizona 5.9
- 282GilroyCalifornia 5.9
- 282Yuba CityCalifornia 5.9
- 282PocatelloIdaho 5.9
- 282AltamontOregon 5.9
- 282Grants PassOregon 5.9
- 282HermistonOregon 5.9
- 282PortlandOregon 5.9
- 282SalemOregon 5.9
- 282ParklandWashington 5.9
- 304Fruit CoveFlorida 5.8
- 304Saint MatthewsKentucky 5.8
- 304RaymoreMissouri 5.8
- 304East ChicagoIndiana 5.8
- 304Ann Arborlow-cost sensorsMichigan 5.8
- 304Saint CloudMinnesota 5.8
- 304Oconomowoclow-cost sensorsWisconsin 5.8
- 304LongmontColorado 5.8
- 304RentonWashington 5.8
- 304Spokane ValleyWashington 5.8
- 314Fort SmithArkansas 5.7
- 314MiamiFlorida 5.7
- 314AthensGeorgia 5.7
- 314FishersIndiana 5.7
- 314SpringfieldOhio 5.7
- 314ChampaignIllinois 5.7
- 314PortageIndiana 5.7
- 314South BendIndiana 5.7
- 314Saint MichaelMinnesota 5.7
- 314Eau ClaireWisconsin 5.7
- 314El CentroCalifornia 5.7
- 314GaltCalifornia 5.7
- 314IndioCalifornia 5.7
- 314South Lake TahoeCalifornia 5.7
- 314DenverColorado 5.7
- 314Dodge CityKansas 5.7
- 314LaceyWashington 5.7
- 314Moses LakeWashington 5.7
- 314Port AngelesWashington 5.7
- 314Candler-McAfeeGeorgia 5.7
- 334PaducahKentucky 5.6
- 334TampaFlorida 5.6
- 334BaltimoreMaryland 5.6
- 334Wake Forestlow-cost sensorsNorth Carolina 5.6
- 334White OakOhio 5.6
- 334HuntingtonWest Virginia 5.6
- 334AndersonIndiana 5.6
- 334Apple ValleyMinnesota 5.6
- 334West MifflinPennsylvania 5.6
- 334FolsomCalifornia 5.6
- 334LompocCalifornia 5.6
- 334MartinezCalifornia 5.6
- 334Salt Lake CityUtah 5.6
- 334CentraliaWashington 5.6
- 334TacomaWashington 5.6
- 349GainesvilleFlorida 5.5
- 349Oak RidgeFlorida 5.5
- 349St. PetersburgFlorida 5.5
- 349ValricoFlorida 5.5
- 349GainesvilleGeorgia 5.5
- 349CaryIllinois 5.5
- 349DublinOhio 5.5
- 349Twin FallsIdaho 5.5
- 349MilwaukieOregon 5.5
- 349RoseburgOregon 5.5
- 349WoodburnOregon 5.5
- 349Arden-ArcadeCalifornia 5.5
- 349Tri-CitiesWashington 5.5
- 362HueytownAlabama 5.4
- 362TrussvilleAlabama 5.4
- 362ColumbusGeorgia 5.4
- 362JasperIndiana 5.4
- 362AshlandKentucky 5.4
- 362JeffersontownKentucky 5.4
- 362FayettevilleNorth Carolina 5.4
- 362MorrisvilleNorth Carolina 5.4
- 362North CharlestonSouth Carolina 5.4
- 362ChattanoogaTennessee 5.4
- 362CharlestonWest Virginia 5.4
- 362Michigan CityIndiana 5.4
- 362Lincoln ParkMichigan 5.4
- 362Grand IslandNebraska 5.4
- 362AberdeenSouth Dakota 5.4
- 362PleasantonCalifornia 5.4
- 362Redwood CityCalifornia 5.4
- 362GreshamOregon 5.4
- 362BellinghamWashington 5.4
- 381BloomingtonIndiana 5.3
- 381ClaytonNorth Carolina 5.3
- 381LebanonOhio 5.3
- 381GreenvilleSouth Carolina 5.3
- 381TaylorTexas 5.3
- 381Bay CityMichigan 5.3
- 381MadisonWisconsin 5.3
- 381BanningCalifornia 5.3
- 381TemeculaCalifornia 5.3
- 381LittletonColorado 5.3
- 381HobbsNew Mexico 5.3
- 381BozemanMontana 5.3
- 381MagnaUtah 5.3
- 381LongviewWashington 5.3
- 381ShorelineWashington 5.3
- 396OrlandoFlorida 5.2
- 396Palm CityFlorida 5.2
- 396Lexington-FayetteKentucky 5.2
- 396LibertyMissouri 5.2
- 396Toms RiverNew Jersey 5.2
- 396JacksonTennessee 5.2
- 396KnoxvilleTennessee 5.2
- 396PflugervilleTexas 5.2
- 396New HavenConnecticut 5.2
- 396AkronOhio 5.2
- 396YoungstownOhio 5.2
- 396ReddingCalifornia 5.2
- 396McMinnvilleOregon 5.2
- 396BadgerAlaska 5.2
- 410JenisonMichigan 5.1
- 410ElizabethNew Jersey 5.1
- 410LancasterPennsylvania 5.1
- 410PittsburghPennsylvania 5.1
- 414DecaturAlabama 5.0
- 414HuntsvilleAlabama 5.0
- 414Lake MaryFlorida 5.0
- 414Palm BayFlorida 5.0
- 414South VinelandNew Jersey 5.0
- 414SpartanburgSouth Carolina 5.0
- 414LincolnNebraska 5.0
- 414ToledoOhio 5.0
- 414McKeesportPennsylvania 5.0
- 414AppletonWisconsin 5.0
- 414Palo Altolow-cost sensorsCalifornia 5.0
- 414AlbuquerqueNew Mexico 5.0
- 414BeavertonOregon 5.0
- 414EugeneOregon 5.0
- 414BountifulUtah 5.0
- 414OremUtah 5.0
- 414BurienWashington 5.0
- 414Four CornersFlorida 5.0
- 432WashingtonDistrict of Columbia 4.9
- 432Fort LauderdaleFlorida 4.9
- 432DurhamNorth Carolina 4.9
- 432Winston-SalemNorth Carolina 4.9
- 432ClarksvilleTennessee 4.9
- 432AshburnVirginia 4.9
- 432NorthbrookIllinois 4.9
- 432LansingMichigan 4.9
- 432Jersey CityNew Jersey 4.9
- 432LebanonPennsylvania 4.9
- 432PawtucketRhode Island 4.9
- 432Green BayWisconsin 4.9
- 432WaukeshaWisconsin 4.9
- 432SalinasCalifornia 4.9
- 432Sunland ParkNew Mexico 4.9
- 432Coos BayOregon 4.9
- 432The DallesOregon 4.9
- 432Salmon CreekWashington 4.9
- 450NewarkDelaware 4.8
- 450Safety HarborFlorida 4.8
- 450SarasotaFlorida 4.8
- 450ElizabethtownKentucky 4.8
- 450RaleighNorth Carolina 4.8
- 450MasonOhio 4.8
- 450MaryvilleTennessee 4.8
- 450HartfordConnecticut 4.8
- 450KokomoIndiana 4.8
- 450SpringfieldMassachusetts 4.8
- 450SouthfieldMichigan 4.8
- 450TaylorMichigan 4.8
- 450PatersonNew Jersey 4.8
- 450New York CityNew York 4.8
- 450Casas AdobesArizona 4.8
- 450WindsorColorado 4.8
- 450PullmanWashington 4.8
- 467Deerfield BeachFlorida 4.7
- 467Delray BeachFlorida 4.7
- 467Winter ParkFlorida 4.7
- 467NicholasvilleKentucky 4.7
- 467ScaggsvilleMaryland 4.7
- 467ClemmonsNorth Carolina 4.7
- 467Saint AndrewsSouth Carolina 4.7
- 467ColumbiaTennessee 4.7
- 467DanburyConnecticut 4.7
- 467HaverhillMassachusetts 4.7
- 467EastpointeMichigan 4.7
- 467Port HuronMichigan 4.7
- 467YpsilantiMichigan 4.7
- 467La VistaNebraska 4.7
- 467HarrisburgPennsylvania 4.7
- 467ProvidenceRhode Island 4.7
- 467FillmoreCalifornia 4.7
- 467VacavilleCalifornia 4.7
- 467Lakewoodlow-cost sensorsColorado 4.7
- 467Rio RanchoNew Mexico 4.7
- 467Cedar CityUtah 4.7
- 467CondaIdaho 4.7
- 467BremertonWashington 4.7
- 467Walla WallaWashington 4.7
- 491Belle GladeFlorida 4.6
- 491Fort MyersFlorida 4.6
- 491AshevilleNorth Carolina 4.6
- 491PhiladelphiaPennsylvania 4.6
- 491HendersonvilleTennessee 4.6
- 491ChesapeakeVirginia 4.6
- 491ZionIllinois 4.6
- 491BayonneNew Jersey 4.6
- 491BuffaloNew York 4.6
- 491BensalemPennsylvania 4.6
- 491WeirtonWest Virginia 4.6
- 491Spring ValleyNevada 4.6
- 503Fort ThomasKentucky 4.5
- 503GreensboroNorth Carolina 4.5
- 503DyersburgTennessee 4.5
- 503BostonMassachusetts 4.5
- 503ScrantonPennsylvania 4.5
- 503DavisCalifornia 4.5
- 503Arvadalow-cost sensorsColorado 4.5
- 503PuebloColorado 4.5
- 503LubbockTexas 4.5
- 503BillingsMontana 4.5
- 503ButteMontana 4.5
- 503Spanish ForkUtah 4.5
- 515EssexMaryland 4.4
- 515SewellNew Jersey 4.4
- 515HarrisonburgVirginia 4.4
- 515BrocktonMassachusetts 4.4
- 515HolbrookNew York 4.4
- 515JohnstownPennsylvania 4.4
- 515WilkinsburgPennsylvania 4.4
- 515LivermoreCalifornia 4.4
- 515Santa CruzCalifornia 4.4
- 515TracyCalifornia 4.4
- 515MissoulaMontana 4.4
- 515AberdeenWashington 4.4
- 515FairbanksAlaska 4.4
- 528WellingtonFlorida 4.3
- 528McDonoughGeorgia 4.3
- 528ColumbusIndiana 4.3
- 528GreenvilleNorth Carolina 4.3
- 528HickoryNorth Carolina 4.3
- 528PennsaukenNew Jersey 4.3
- 528CookevilleTennessee 4.3
- 528KingsportTennessee 4.3
- 528RichmondVirginia 4.3
- 528SpringfieldVirginia 4.3
- 528KeeneNew Hampshire 4.3
- 528Fort LeeNew Jersey 4.3
- 528New BrunswickNew Jersey 4.3
- 528UticaNew York 4.3
- 528BethlehemPennsylvania 4.3
- 528CarlislePennsylvania 4.3
- 528ReadingPennsylvania 4.3
- 528MaranaArizona 4.3
- 528TruckeeCalifornia 4.3
- 528BendOregon 4.3
- 528Brigham CityUtah 4.3
- 528HerrimanUtah 4.3
- 550DavieFlorida 4.2
- 550FraminghamMassachusetts 4.2
- 550PortlandMaine 4.2
- 550South MilwaukeeWisconsin 4.2
- 550LancasterCalifornia 4.2
- 550AshlandOregon 4.2
- 550DallasOregon 4.2
- 557ChesterPennsylvania 4.1
- 557Short PumpVirginia 4.1
- 557WaterburyConnecticut 4.1
- 557GreenfieldMassachusetts 4.1
- 557PittsfieldMassachusetts 4.1
- 557MedinaOhio 4.1
- 557Colorado SpringsColorado 4.1
- 557Apache JunctionArizona 4.1
- 557North OgdenUtah 4.1
- 557Inglewood-Finn Hilllow-cost sensorsWashington 4.1
- 567WilmingtonDelaware 4.0
- 567Coconut CreekFlorida 4.0
- 567EdgewoodMaryland 4.0
- 567PleasantvilleNew Jersey 4.0
- 567RoanokeVirginia 4.0
- 567LowellMassachusetts 4.0
- 567QuincyMassachusetts 4.0
- 567NewburghNew York 4.0
- 567Shaker HeightsOhio 4.0
- 567EriePennsylvania 4.0
- 567NorristownPennsylvania 4.0
- 567State CollegePennsylvania 4.0
- 567RutlandVermont 4.0
- 567BridgeportConnecticut 4.0
- 567ParadiseCalifornia 4.0
- 567BoulderColorado 4.0
- 567Oxon Hill-GlassmanorMaryland 4.0
- 584DoverDelaware 3.9
- 584WestonFlorida 3.9
- 584RockvilleMaryland 3.9
- 584CharlottesvilleVirginia 3.9
- 584East HamptonVirginia 3.9
- 584Cleveland HeightsOhio 3.9
- 584LewistonMaine 3.9
- 584GahannaOhio 3.9
- 584PainesvilleOhio 3.9
- 584AllentownPennsylvania 3.9
- 584AltoonaPennsylvania 3.9
- 584HermitagePennsylvania 3.9
- 584Grand JunctionColorado 3.9
- 584EnterpriseNevada 3.9
- 584HendersonNevada 3.9
- 584RandolphNew Jersey 3.9
- 600HagerstownMaryland 3.8
- 600MilfordMassachusetts 3.8
- 600PortsmouthNew Hampshire 3.8
- 600RochesterNew York 3.8
- 600ConcordCalifornia 3.8
- 600BoiseIdaho 3.8
- 600Idaho FallsIdaho 3.8
- 600PendletonOregon 3.8
- 608BearDelaware 3.7
- 608ElktonMaryland 3.7
- 608HopewellVirginia 3.7
- 608Rose HillVirginia 3.7
- 608Fall RiverMassachusetts 3.7
- 608LynnMassachusetts 3.7
- 608BangorMaine 3.7
- 608Weirton HeightsWest Virginia 3.7
- 608HollisterCalifornia 3.7
- 608BismarckNorth Dakota 3.7
- 608TooeleUtah 3.7
- 608HonoluluHawaii 3.7
- 620New LondonConnecticut 3.6
- 620SyracuseNew York 3.6
- 620Goletalow-cost sensorsCalifornia 3.6
- 620Spanish SpringsNevada 3.6
- 620HelenaMontana 3.6
- 620CorvallisOregon 3.6
- 620KīheiHawaii 3.6
- 627WorcesterMassachusetts 3.5
- 627AugustaMaine 3.5
- 627San RafaelCalifornia 3.5
- 627Carson CityNevada 3.5
- 627HurricaneUtah 3.5
- 627RedmondOregon 3.5
- 627BellevueWashington 3.5
- 627Summerlin SouthNevada 3.5
- 635OrcuttCalifornia 3.4
- 635Las CrucesNew Mexico 3.4
- 635Forest GroveOregon 3.4
- 635Oak HarborWashington 3.4
- 635KahuluiHawaii 3.4
- 640North ChicopeeMassachusetts 3.3
- 640MarquetteMichigan 3.3
- 640BlaineMinnesota 3.3
- 640Kirklandlow-cost sensorsWashington 3.3
- 640HiloHawaii 3.3
- 645Cañon CityColorado 3.2
- 645Ken CarylColorado 3.2
- 647DerryNew Hampshire 3.1
- 647New CityNew York 3.1
- 647White PlainsNew York 3.1
- 647SheridanWyoming 3.1
- 651AtascaderoCalifornia 3.0
- 652GilletteWyoming 2.9
- 652Union Hill-Novelty Hilllow-cost sensorsWashington 2.9
- 654South LaurelMaryland 2.8
- 654Rock SpringsWyoming 2.8
- 656Boulder CityNevada 2.7
- 657Santa RosaCalifornia 2.6
- 657MesquiteNevada 2.6
- 657LaramieWyoming 2.6
- 660CoventryRhode Island 2.5
- 660Middletonlow-cost sensorsWisconsin 2.5
- 660Green ValleyArizona 2.5
- 660Bothelllow-cost sensorsWashington 2.5
- 664Lexingtonlow-cost sensorsMassachusetts 2.4
- 664Mount VernonWashington 2.4
- 666LaconiaNew Hampshire 2.3
- 667CheyenneWyoming 2.2
- 668CasperWyoming 1.9
- 669RidgecrestCalifornia 1.7
- 670Newtonlow-cost sensorsMassachusetts 1.6
- 671Oro Valleylow-cost sensorsArizona 0.3
- 672Parkerlow-cost sensorsColorado 0.2
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
All cities in the world, October 2025 · United States now
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SmogRank, most polluted cities in United States, PM2.5, October 2025, smogrank.com/us/history/2025-10 (accessed 2 Oct 2026).
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