SmogRank / World / United States / April 2026
Most polluted cities in United States, April 2026
665 cities in United States ranked by their average PM2.5 over the 30 days. Worst: Calexico at 18.9 µg/m³, #422 of 2,573 cities in the world. Cleanest: Encinitas at 1.4. A city needs measurements on 70% of the days to be ranked.
← Calexico 18.9 µg/m³
20 µg/m³0
- 1CalexicoCalifornia 27
- 2LaredoTexas 23
- 3MaconGeorgia 22
- 4El PasoTexas 21
- 5ValdostaGeorgia 19
- 5Eagle PassTexas 19
- 7Corpus ChristiTexas 19
- 7Port ArthurTexas 19
- 9MissionTexas 18
- 10LibertyMissouri 18
- 11AugustaGeorgia 18
- 11Jurupa ValleyCalifornia 18
- 13AustinTexas 18
- 14SavannahGeorgia 17
- 15BrunswickGeorgia 17
- 15San AntonioTexas 17
- 17EdinburgTexas 17
- 18BaytownTexas 17
- 19Deer ParkTexas 16
- 20Wake Forestlow-cost sensorsNorth Carolina 16
- 21Warner RobinsGeorgia 16
- 22ColumbusGeorgia 16
- 22BrownsvilleTexas 16
- 22Live OakTexas 16
- 22BrookfieldIllinois 16
- 26Redmondlow-cost sensorsWashington 16
- 27Candler-McAfeeGeorgia 15
- 28West MemphisArkansas 15
- 29PortsmouthOhio 15
- 30DallasTexas 15
- 31ChattanoogaTennessee 15
- 31RiversideCalifornia 15
- 33Little RockArkansas 14
- 33TopekaKansas 14
- 33WichitaKansas 14
- 33SpartanburgSouth Carolina 14
- 33HoustonTexas 14
- 38ShreveportLouisiana 14
- 38FayettevilleNorth Carolina 14
- 38FlorenceSouth Carolina 14
- 38San MarcosTexas 14
- 42AthensGeorgia 14
- 42College StationTexas 14
- 42Fort WorthTexas 14
- 45AlbanyGeorgia 14
- 45PhiladelphiaPennsylvania 14
- 47BirminghamAlabama 14
- 47GadsdenAlabama 14
- 47AshlandKentucky 14
- 50MiddletownOhio 14
- 50CorsicanaTexas 14
- 50PasadenaTexas 14
- 50Sunland ParkNew Mexico 14
- 54BeltonTexas 13
- 54DentonTexas 13
- 56TallahasseeFlorida 13
- 56AtlantaGeorgia 13
- 56DerbyKansas 13
- 56HattiesburgMississippi 13
- 56Saint AndrewsSouth Carolina 13
- 56Cedar ParkTexas 13
- 56TaylorTexas 13
- 56TexarkanaTexas 13
- 56WaterlooIowa 13
- 65SpringdaleArkansas 13
- 65JacksonMississippi 13
- 67ConroeTexas 13
- 67SaginawTexas 13
- 69Ponte Vedra BeachFlorida 13
- 69LouisvilleKentucky 13
- 69MorrisvilleNorth Carolina 13
- 69PflugervilleTexas 13
- 69WyomingMichigan 13
- 69SocorroTexas 13
- 75TulsaOklahoma 13
- 75North CharlestonSouth Carolina 13
- 77HuntsvilleAlabama 12
- 77LawrencevilleGeorgia 12
- 77JeffersonvilleIndiana 12
- 77CharlotteNorth Carolina 12
- 77NorwoodOhio 12
- 77GreenvilleSouth Carolina 12
- 77East RidgeTennessee 12
- 77GalvestonTexas 12
- 77CharlottesvilleVirginia 12
- 86JacksonvilleFlorida 12
- 86Valley StationKentucky 12
- 86LexingtonNorth Carolina 12
- 86Oklahoma CityOklahoma 12
- 86HendersonvilleTennessee 12
- 86KnoxvilleTennessee 12
- 86BrookingsSouth Dakota 12
- 93MontgomeryAlabama 12
- 93MooreOklahoma 12
- 93YorkPennsylvania 12
- 93MaryvilleTennessee 12
- 93ComptonCalifornia 12
- 93FontanaCalifornia 12
- 99OcalaFlorida 12
- 99OwensboroKentucky 12
- 99RaleighNorth Carolina 12
- 99Missouri CityTexas 12
- 99TucsonArizona 12
- 99WhittierCalifornia 12
- 99Great FallsMontana 12
- 99MidwayFlorida 12
- 107ColumbiaTennessee 12
- 107WestervilleOhio 12
- 109Kendale LakesFlorida 12
- 109Baton RougeLouisiana 12
- 109ClaytonNorth Carolina 12
- 109Winston-SalemNorth Carolina 12
- 109CharlestonWest Virginia 12
- 114DecaturAlabama 12
- 114Granite CityIllinois 12
- 114EvansvilleIndiana 12
- 114New AlbanyIndiana 12
- 114SulphurLouisiana 12
- 114BartlettTennessee 12
- 114La PorteTexas 12
- 121TrussvilleAlabama 11
- 121MonroeLouisiana 11
- 121BaltimoreMaryland 11
- 121Mission BendTexas 11
- 121MankatoMinnesota 11
- 126BessemerAlabama 11
- 126PrichardAlabama 11
- 126Ponca CityOklahoma 11
- 126PeoriaIllinois 11
- 126ToledoOhio 11
- 126BakersfieldCalifornia 11
- 126VisaliaCalifornia 11
- 133VeniceFlorida 11
- 133IndianapolisIndiana 11
- 133Saint JosephMissouri 11
- 133GreenvilleNorth Carolina 11
- 133MasonOhio 11
- 133JacksonTennessee 11
- 133MuscatineIowa 11
- 133DoltonIllinois 11
- 133HammondIndiana 11
- 133LancasterPennsylvania 11
- 133LebanonPennsylvania 11
- 133AnaheimCalifornia 11
- 133Los AngelesCalifornia 11
- 146ChesapeakeVirginia 11
- 146HarrisonburgVirginia 11
- 146HuntingtonWest Virginia 11
- 146Calumet CityIllinois 11
- 146ClevelandOhio 11
- 146SteubenvilleOhio 11
- 152McDonoughGeorgia 11
- 152HernandoMississippi 11
- 152ClemmonsNorth Carolina 11
- 152CincinnatiOhio 11
- 152ColumbusOhio 11
- 152SpringfieldOhio 11
- 152Fort WayneIndiana 11
- 152PerrysburgOhio 11
- 152West MifflinPennsylvania 11
- 152Long BeachCalifornia 11
- 162Ferry PassFlorida 11
- 162MiamiFlorida 11
- 162GreensboroNorth Carolina 11
- 162HickoryNorth Carolina 11
- 162EdmondOklahoma 11
- 162JenksOklahoma 11
- 162BridgeviewIllinois 11
- 162RedfordMichigan 11
- 162OregonOhio 11
- 171Bonita SpringsFlorida 11
- 171Fort LauderdaleFlorida 11
- 171Fruit CoveFlorida 11
- 171Palm CityFlorida 11
- 171GainesvilleGeorgia 11
- 171JeffersontownKentucky 11
- 171Saint MatthewsKentucky 11
- 171New OrleansLouisiana 11
- 171DaytonOhio 11
- 171Franklin ParkIllinois 11
- 171BensalemPennsylvania 11
- 182GainesvilleFlorida 10
- 182TampaFlorida 10
- 182ValricoFlorida 10
- 182AshevilleNorth Carolina 10
- 182LawtonOklahoma 10
- 182DyersburgTennessee 10
- 182FlintMichigan 10
- 182NipomoCalifornia 10
- 182San DiegoCalifornia 10
- 182HobbsNew Mexico 10
- 192Belle GladeFlorida 10
- 192West PensacolaFlorida 10
- 192GulfportMississippi 10
- 192Roanoke RapidsNorth Carolina 10
- 192CookevilleTennessee 10
- 192Evanstonlow-cost sensorsIllinois 10
- 192PhoenixArizona 10
- 192Picnic Point-North LynnwoodWashington 10
- 200St. PetersburgFlorida 10
- 200BloomingtonIndiana 10
- 200ElizabethtownKentucky 10
- 200EssexMaryland 10
- 200PascagoulaMississippi 10
- 200Toms RiverNew Jersey 10
- 200LebanonOhio 10
- 200McAlesterOklahoma 10
- 200Fort DodgeIowa 10
- 200EwingNew Jersey 10
- 200Chula VistaCalifornia 10
- 200Lake ElsinoreCalifornia 10
- 200MercedCalifornia 10
- 200OdessaTexas 10
- 214WashingtonDistrict of Columbia 10
- 214Oak RidgeFlorida 10
- 214Pompano BeachFlorida 10
- 214NicholasvilleKentucky 10
- 214ClarksvilleTennessee 10
- 214ReadingPennsylvania 10
- 214WatertownSouth Dakota 10
- 221HomesteadFlorida 10
- 221JasperIndiana 10
- 221PennsaukenNew Jersey 10
- 221East HamptonVirginia 10
- 221HopewellVirginia 10
- 221ClintonIowa 10
- 221Des PlainesIllinois 10
- 221HarrisburgPennsylvania 10
- 221Casas AdobesArizona 10
- 221NogalesArizona 10
- 221IndioCalifornia 10
- 221PortervilleCalifornia 10
- 233PaducahKentucky 10
- 233Fort MyersFlorida 10
- 233OlatheKansas 10
- 233Lexington-FayetteKentucky 10
- 233ChalmetteLouisiana 10
- 233KennerLouisiana 10
- 233SpringfieldMissouri 10
- 233DurhamNorth Carolina 10
- 233ConwaySouth Carolina 10
- 233RichmondVirginia 10
- 233Elmwood ParkIllinois 10
- 233AndersonIndiana 10
- 233East ChicagoIndiana 10
- 233ElkhartIndiana 10
- 233LafayetteIndiana 10
- 233Royal Oaklow-cost sensorsMichigan 10
- 233New York CityNew York 10
- 233OaklandCalifornia 10
- 251Fort SmithArkansas 10
- 251East Saint LouisIllinois 10
- 251Upper AltonIllinois 10
- 251LafayetteLouisiana 10
- 251Atlantic CityNew Jersey 10
- 251RoanokeVirginia 10
- 251Short PumpVirginia 10
- 251JolietIllinois 10
- 251MuncieIndiana 10
- 251South BendIndiana 10
- 251CarlislePennsylvania 10
- 251Arroyo GrandeCalifornia 10
- 251CorcoranCalifornia 10
- 251Mission ViejoCalifornia 10
- 265WilmingtonDelaware 9
- 265Daytona BeachFlorida 9
- 265Safety HarborFlorida 9
- 265Columbialow-cost sensorsMissouri 9
- 265St. LouisMissouri 9
- 265SalemVirginia 9
- 265ChicagoIllinois 9
- 265ElizabethNew Jersey 9
- 265CantonOhio 9
- 265DublinOhio 9
- 265WarrenOhio 9
- 265VictorvilleCalifornia 9
- 265Columbia CityWashington 9
- 278SarasotaFlorida 9
- 278SpringfieldVirginia 9
- 278Oak LawnIllinois 9
- 278PortageIndiana 9
- 278DearbornMichigan 9
- 278DetroitMichigan 9
- 278HolbrookNew York 9
- 278Casa GrandeArizona 9
- 278PowayCalifornia 9
- 278San FranciscoCalifornia 9
- 278Santa BarbaraCalifornia 9
- 278Apache JunctionArizona 9
- 278SeattleWashington 9
- 278Four CornersFlorida 9
- 292Deerfield BeachFlorida 9
- 292Delray BeachFlorida 9
- 292OrlandoFlorida 9
- 292DecaturIllinois 9
- 292Kansas CityKansas 9
- 292South VinelandNew Jersey 9
- 292KingsportTennessee 9
- 292Cleveland HeightsOhio 9
- 292New HavenConnecticut 9
- 292AuroraIllinois 9
- 292ChampaignIllinois 9
- 292NapervilleIllinois 9
- 292Michigan CityIndiana 9
- 292Lincoln ParkMichigan 9
- 292Jersey CityNew Jersey 9
- 292BuffaloNew York 9
- 292PittsburghPennsylvania 9
- 292YumaArizona 9
- 292BrawleyCalifornia 9
- 292San Luis ObispoCalifornia 9
- 292LewistonIdaho 9
- 313Hunt ValleyMaryland 9
- 313AshburnVirginia 9
- 313AnkenyIowa 9
- 313ElginIllinois 9
- 313Fort LeeNew Jersey 9
- 313WilkinsburgPennsylvania 9
- 313Oconomowoclow-cost sensorsWisconsin 9
- 313BridgeportConnecticut 9
- 313TempeArizona 9
- 313Delanolow-cost sensorsCalifornia 9
- 313El CajonCalifornia 9
- 313OceansideCalifornia 9
- 313South Lake TahoeCalifornia 9
- 313UkiahCalifornia 9
- 327Fort ThomasKentucky 9
- 327White OakOhio 9
- 327Rose HillVirginia 9
- 327RockfordIllinois 9
- 327BrocktonMassachusetts 9
- 327KalamazooMichigan 9
- 327LindenNew Jersey 9
- 327PatersonNew Jersey 9
- 327WeirtonWest Virginia 9
- 327BurbankCalifornia 9
- 327TacomaWashington 9
- 338East LakeFlorida 9
- 338WellingtonFlorida 9
- 338Des MoinesIowa 9
- 338AkronOhio 9
- 338MedinaOhio 9
- 338YoungstownOhio 9
- 338NorristownPennsylvania 9
- 338El CentroCalifornia 9
- 338FresnoCalifornia 9
- 338SalinasCalifornia 9
- 338Santa ClaritaCalifornia 9
- 338WoodlandCalifornia 9
- 338BendOregon 9
- 351DavieFlorida 9
- 351ArnoldMissouri 9
- 351University CityMissouri 9
- 351ChesterPennsylvania 9
- 351DavenportIowa 9
- 351MolineIllinois 9
- 351Bay CityMichigan 9
- 351PainesvilleOhio 9
- 351Shaker HeightsOhio 9
- 351ClovisCalifornia 9
- 351Santa CruzCalifornia 9
- 351NampaIdaho 9
- 363Palm BayFlorida 8
- 363PleasantvilleNew Jersey 8
- 363SewellNew Jersey 8
- 363Iowa CityIowa 8
- 363FraminghamMassachusetts 8
- 363Grand RapidsMichigan 8
- 363MinneapolisMinnesota 8
- 363McKeesportPennsylvania 8
- 363MesaArizona 8
- 363San JoseCalifornia 8
- 363Simi ValleyCalifornia 8
- 363StocktonCalifornia 8
- 363ThorntonColorado 8
- 363RandolphNew Jersey 8
- 377BearDelaware 8
- 377SpringfieldIllinois 8
- 377ScaggsvilleMaryland 8
- 377RaymoreMissouri 8
- 377New LondonConnecticut 8
- 377BloomingtonIllinois 8
- 377PortlandMaine 8
- 377BurnsvilleMinnesota 8
- 377RochesterMinnesota 8
- 377JohnstownPennsylvania 8
- 377State CollegePennsylvania 8
- 377MilwaukeeWisconsin 8
- 377MillcreekUtah 8
- 377BellinghamWashington 8
- 377Arden-ArcadeCalifornia 8
- 392Lake MaryFlorida 8
- 392Cedar RapidsIowa 8
- 392GaryIndiana 8
- 392JenisonMichigan 8
- 392AllentownPennsylvania 8
- 392ScrantonPennsylvania 8
- 392SuperiorWisconsin 8
- 392PaysonArizona 8
- 392DavisCalifornia 8
- 392San LeandroCalifornia 8
- 392Coeur d'AleneIdaho 8
- 392RentonWashington 8
- 404BostonMassachusetts 8
- 404Fall RiverMassachusetts 8
- 404LynnMassachusetts 8
- 404SouthfieldMichigan 8
- 404EriePennsylvania 8
- 404Upper Saint ClairPennsylvania 8
- 404BanningCalifornia 8
- 404TemeculaCalifornia 8
- 404BozemanMontana 8
- 413FairhopeAlabama 8
- 413Coconut CreekFlorida 8
- 413LeawoodKansas 8
- 413ElktonMaryland 8
- 413EastpointeMichigan 8
- 413YpsilantiMichigan 8
- 413ShakopeeMinnesota 8
- 413LincolnNebraska 8
- 413BethlehemPennsylvania 8
- 413WaukeshaWisconsin 8
- 413AtascaderoCalifornia 8
- 413GlendoraCalifornia 8
- 413LaceyWashington 8
- 413VancouverWashington 8
- 427EdgewoodMaryland 8
- 427LemayMissouri 8
- 427HaverhillMassachusetts 8
- 427TaylorMichigan 8
- 427Apple ValleyMinnesota 8
- 427Saint PaulMinnesota 8
- 427HermitagePennsylvania 8
- 427Weirton HeightsWest Virginia 8
- 427Santa RosaCalifornia 8
- 427Fort CollinsColorado 8
- 427OremUtah 8
- 427YakimaWashington 8
- 439NewarkDelaware 8
- 439Kansas CityMissouri 8
- 439HartfordConnecticut 8
- 439TrentonNew Jersey 8
- 439MadisonWisconsin 8
- 439FillmoreCalifornia 8
- 439GlendaleArizona 8
- 439MaranaArizona 8
- 439HanfordCalifornia 8
- 439DenverColorado 8
- 439GreeleyColorado 8
- 439LongmontColorado 8
- 439West JordanUtah 8
- 439AuburnWashington 8
- 453DanburyConnecticut 7
- 453CaryIllinois 7
- 453QuincyMassachusetts 7
- 453SpringfieldMassachusetts 7
- 453Port HuronMichigan 7
- 453BayonneNew Jersey 7
- 453AltoonaPennsylvania 7
- 453RutlandVermont 7
- 453South MilwaukeeWisconsin 7
- 453LivermoreCalifornia 7
- 453Santa Monicalow-cost sensorsCalifornia 7
- 453Las CrucesNew Mexico 7
- 453Grants PassOregon 7
- 453Oxon Hill-GlassmanorMaryland 7
- 467WaterburyConnecticut 7
- 467LansingMichigan 7
- 467TurlockCalifornia 7
- 467RenoNevada 7
- 467AmarilloTexas 7
- 467LubbockTexas 7
- 467HighlandUtah 7
- 474RockvilleMaryland 7
- 474South LaurelMaryland 7
- 474LowellMassachusetts 7
- 474WorcesterMassachusetts 7
- 474BlaineMinnesota 7
- 474ProvidenceRhode Island 7
- 474Dodge CityKansas 7
- 474SunnysideWashington 7
- 474WenatcheeWashington 7
- 474FairbanksAlaska 7
- 484NorthbrookIllinois 7
- 484ZionIllinois 7
- 484DuluthMinnesota 7
- 484New BrunswickNew Jersey 7
- 484AppletonWisconsin 7
- 484BerkeleyCalifornia 7
- 484LancasterCalifornia 7
- 484ReddingCalifornia 7
- 484TigardOregon 7
- 484West Valley CityUtah 7
- 484SpokaneWashington 7
- 495PortsmouthNew Hampshire 7
- 495RochesterNew York 7
- 495Eau ClaireWisconsin 7
- 495MaderaCalifornia 7
- 495MantecaCalifornia 7
- 495RosevilleCalifornia 7
- 501Saint CloudMinnesota 7
- 501Saint MichaelMinnesota 7
- 501OmahaNebraska 7
- 501NewburghNew York 7
- 501GahannaOhio 7
- 501SacramentoCalifornia 7
- 501Tularelow-cost sensorsCalifornia 7
- 501Colorado SpringsColorado 7
- 501Spanish SpringsNevada 7
- 501HillsboroOregon 7
- 501SalemOregon 7
- 501EllensburgWashington 7
- 501ShorelineWashington 7
- 501Spokane ValleyWashington 7
- 501Tri-CitiesWashington 7
- 516GilroyCalifornia 7
- 516OxnardCalifornia 7
- 516Thousand OaksCalifornia 7
- 516ButteMontana 7
- 516Coos BayOregon 7
- 516Salt Lake CityUtah 7
- 516Spanish ForkUtah 7
- 516BremertonWashington 7
- 516BurienWashington 7
- 516BadgerAlaska 7
- 526MilfordMassachusetts 6
- 526West FargoNorth Dakota 6
- 526Green BayWisconsin 6
- 526GaltCalifornia 6
- 526HollisterCalifornia 6
- 526PleasantonCalifornia 6
- 526San RafaelCalifornia 6
- 526Arvadalow-cost sensorsColorado 6
- 526MoscowIdaho 6
- 526AltamontOregon 6
- 536GreenfieldMassachusetts 6
- 536AlbanyNew York 6
- 536Ken CarylColorado 6
- 536Rio RanchoNew Mexico 6
- 536Cedar CityUtah 6
- 536Moses LakeWashington 6
- 542HueytownAlabama 6
- 542Lexingtonlow-cost sensorsMassachusetts 6
- 542LewistonMaine 6
- 542HollandMichigan 6
- 542BellevueNebraska 6
- 542La VistaNebraska 6
- 542DerryNew Hampshire 6
- 542KeeneNew Hampshire 6
- 542SyracuseNew York 6
- 542PawtucketRhode Island 6
- 542RidgecrestCalifornia 6
- 542PuebloColorado 6
- 542AlbuquerqueNew Mexico 6
- 542WindsorColorado 6
- 542KīheiHawaii 6
- 542HonoluluHawaii 6
- 558HagerstownMaryland 6
- 558North ChicopeeMassachusetts 6
- 558PittsfieldMassachusetts 6
- 558AugustaMaine 6
- 558Grand IslandNebraska 6
- 558ConcordCalifornia 6
- 558ParadiseCalifornia 6
- 558TracyCalifornia 6
- 558Las VegasNevada 6
- 558BoulderColorado 6
- 558Twin FallsIdaho 6
- 558CanbyOregon 6
- 558GreshamOregon 6
- 558MedfordOregon 6
- 558HiloHawaii 6
- 573BangorMaine 6
- 573Redwood CityCalifornia 6
- 573Yuba CityCalifornia 6
- 573HurricaneUtah 6
- 573HelenaMontana 6
- 578UticaNew York 6
- 578VallejoCalifornia 6
- 578AlbanyOregon 6
- 578EugeneOregon 6
- 578PortlandOregon 6
- 578The DallesOregon 6
- 578CentraliaWashington 6
- 585White PlainsNew York 6
- 585ModestoCalifornia 6
- 585OrcuttCalifornia 6
- 585Idaho FallsIdaho 6
- 585BountifulUtah 6
- 585Brigham CityUtah 6
- 585MagnaUtah 6
- 585Salmon CreekWashington 6
- 593Sioux FallsSouth Dakota 5
- 593Torrancelow-cost sensorsCalifornia 5
- 593Boulder CityNevada 5
- 593BillingsMontana 5
- 593Oregon CityOregon 5
- 593TooeleUtah 5
- 593AberdeenWashington 5
- 593AnchorageAlaska 5
- 601Green ValleyArizona 5
- 601LincolnCalifornia 5
- 601Carson CityNevada 5
- 601North OgdenUtah 5
- 601KahuluiHawaii 5
- 606LimaOhio 5
- 606AberdeenSouth Dakota 5
- 606ChicoCalifornia 5
- 606MilwaukieOregon 5
- 606RoseburgOregon 5
- 606WoodburnOregon 5
- 606Oak HarborWashington 5
- 613New CityNew York 5
- 613Los Banoslow-cost sensorsCalifornia 5
- 613EnterpriseNevada 5
- 613AshlandOregon 5
- 613BeavertonOregon 5
- 613PendletonOregon 5
- 613HerrimanUtah 5
- 613KentWashington 5
- 613LongviewWashington 5
- 622CoventryRhode Island 5
- 622TruckeeCalifornia 5
- 622Cañon CityColorado 5
- 622HendersonNevada 5
- 622Spring ValleyNevada 5
- 622MissoulaMontana 5
- 622RedmondOregon 5
- 629MarquetteMichigan 5
- 629Brookfieldlow-cost sensorsWisconsin 5
- 629FolsomCalifornia 5
- 629PocatelloIdaho 5
- 629GilletteWyoming 5
- 629SheridanWyoming 5
- 635BoiseIdaho 5
- 635Summerlin SouthNevada 5
- 637LompocCalifornia 4
- 637VacavilleCalifornia 4
- 637Grand JunctionColorado 4
- 637Walla WallaWashington 4
- 637Rock SpringsWyoming 4
- 642Newtonlow-cost sensorsMassachusetts 4
- 642LaconiaNew Hampshire 4
- 642Pasadenalow-cost sensorsCalifornia 4
- 642CorvallisOregon 4
- 646DallasOregon 4
- 647Middletonlow-cost sensorsWisconsin 4
- 647MesquiteNevada 4
- 647Forest GroveOregon 4
- 647CasperWyoming 4
- 651Huntington Beachlow-cost sensorsCalifornia 4
- 651Kirklandlow-cost sensorsWashington 4
- 651PullmanWashington 4
- 654BellevueWashington 4
- 654Mount VernonWashington 4
- 654CheyenneWyoming 4
- 654LaramieWyoming 4
- 658AnacortesWashington 4
- 659MartinezCalifornia 3
- 660Union Hill-Novelty Hilllow-cost sensorsWashington 3
- 661Palo Altolow-cost sensorsCalifornia 3
- 661McMinnvilleOregon 3
- 661Bothelllow-cost sensorsWashington 3
- 664Goletalow-cost sensorsCalifornia 3
- 665Encinitaslow-cost sensorsCalifornia 2
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+
China's Air Quality Index (HJ 633-2012), PM2.5 individual index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
All cities in the world, April 2026 · United States now
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SmogRank, most polluted cities in United States, PM2.5, April 2026, smogrank.com/us/history/2026-04 (accessed 2 Oct 2026).
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