SmogRank / World / United States / March 2026
Most polluted cities in United States, March 2026
669 cities in United States ranked by their average PM2.5 over the 31 days. Worst: South Lake Tahoe at 32.5 µg/m³, #209 of 2,616 cities in the world. Cleanest: Union Hill-Novelty Hill at 1.2. A city needs measurements on 70% of the days to be ranked.
← South Lake Tahoe 32.5 µg/m³
30 µg/m³0
- 1South Lake TahoeCalifornia 47
- 2CalexicoCalifornia 34
- 3Delanolow-cost sensorsCalifornia 28
- 4Tularelow-cost sensorsCalifornia 25
- 5AlbanyGeorgia 23
- 6MaconGeorgia 23
- 7Jurupa ValleyCalifornia 22
- 8PortervilleCalifornia 22
- 9BadgerAlaska 22
- 10RedfordMichigan 21
- 11BakersfieldCalifornia 21
- 11VisaliaCalifornia 21
- 13ColumbusGeorgia 20
- 13WhittierCalifornia 20
- 15AugustaGeorgia 20
- 15ChattanoogaTennessee 20
- 15El PasoTexas 20
- 18Hawthornelow-cost sensorsCalifornia 20
- 19Inglewoodlow-cost sensorsCalifornia 19
- 20WichitaKansas 19
- 21RiversideCalifornia 19
- 22Royal Oaklow-cost sensorsMichigan 19
- 22Los AngelesCalifornia 19
- 22Pasadenalow-cost sensorsCalifornia 19
- 25TallahasseeFlorida 19
- 25Wake Forestlow-cost sensorsNorth Carolina 19
- 25LaredoTexas 19
- 25FontanaCalifornia 19
- 29AthensGeorgia 18
- 30GadsdenAlabama 18
- 31Warner RobinsGeorgia 18
- 32MontgomeryAlabama 18
- 32Carsonlow-cost sensorsCalifornia 18
- 32ComptonCalifornia 18
- 32Candler-McAfeeGeorgia 18
- 36BrookfieldIllinois 18
- 37Santa Monicalow-cost sensorsCalifornia 18
- 38SocorroTexas 18
- 39OdessaTexas 17
- 40SpartanburgSouth Carolina 17
- 41East RidgeTennessee 17
- 41CorcoranCalifornia 17
- 41Huntington Beachlow-cost sensorsCalifornia 17
- 44ValdostaGeorgia 17
- 44Skokielow-cost sensorsIllinois 17
- 46Torrancelow-cost sensorsCalifornia 17
- 47DerbyKansas 17
- 47TopekaKansas 17
- 47Nileslow-cost sensorsIllinois 17
- 47FresnoCalifornia 17
- 51SpringdaleArkansas 17
- 51FairbanksAlaska 17
- 53AnaheimCalifornia 16
- 54BessemerAlabama 16
- 54TulsaOklahoma 16
- 56Ponca CityOklahoma 16
- 57Camdenlow-cost sensorsNew Jersey 16
- 57WaterlooIowa 16
- 57Evanstonlow-cost sensorsIllinois 16
- 57San DiegoCalifornia 16
- 61LawrencevilleGeorgia 16
- 61JacksonMississippi 16
- 61North CharlestonSouth Carolina 16
- 64BirminghamAlabama 16
- 64MissionTexas 16
- 64Blue Islandlow-cost sensorsIllinois 16
- 64Evergreen Parklow-cost sensorsIllinois 16
- 68HuntsvilleAlabama 16
- 68SavannahGeorgia 16
- 68FlorenceSouth Carolina 16
- 68GreenvilleSouth Carolina 16
- 68HanfordCalifornia 16
- 68Long BeachCalifornia 16
- 68Eagle PassTexas 16
- 75West MemphisArkansas 15
- 75MuscatineIowa 15
- 75BridgeviewIllinois 15
- 75Chula VistaCalifornia 15
- 79TrussvilleAlabama 15
- 79AshlandKentucky 15
- 79PhiladelphiaPennsylvania 15
- 82Little RockArkansas 15
- 82GainesvilleGeorgia 15
- 82Winston-SalemNorth Carolina 15
- 82WyomingMichigan 15
- 82Lomitalow-cost sensorsCalifornia 15
- 87AtlantaGeorgia 15
- 87CharlotteNorth Carolina 15
- 87Saint AndrewsSouth Carolina 15
- 87TexarkanaTexas 15
- 87Franklin ParkIllinois 15
- 87Brookfieldlow-cost sensorsWisconsin 15
- 87HobbsNew Mexico 15
- 94Granite CityIllinois 15
- 94HattiesburgMississippi 15
- 94Corpus ChristiTexas 15
- 94Abingtonlow-cost sensorsPennsylvania 15
- 94NogalesArizona 15
- 99DecaturAlabama 15
- 99ShreveportLouisiana 15
- 99BurbankCalifornia 15
- 102Saint JosephMissouri 15
- 102ClemmonsNorth Carolina 15
- 102LexingtonNorth Carolina 15
- 102MorrisvilleNorth Carolina 15
- 102JenksOklahoma 15
- 102ClintonIowa 15
- 102ElginIllinois 15
- 109MooreOklahoma 14
- 109KnoxvilleTennessee 14
- 109NashvilleTennessee 14
- 109Calumet CityIllinois 14
- 113OlatheKansas 14
- 113Columbialow-cost sensorsMissouri 14
- 113PortsmouthOhio 14
- 113HendersonvilleTennessee 14
- 113DoltonIllinois 14
- 113Oconomowoclow-cost sensorsWisconsin 14
- 119EvansvilleIndiana 14
- 119FayettevilleNorth Carolina 14
- 119BaytownTexas 14
- 119Iowa CityIowa 14
- 119Elmwood ParkIllinois 14
- 119PeoriaIllinois 14
- 119HammondIndiana 14
- 119Sunland ParkNew Mexico 14
- 127Kansas CityKansas 14
- 127YorkPennsylvania 14
- 127BrownsvilleTexas 14
- 127EdinburgTexas 14
- 127ChicagoIllinois 14
- 127Des PlainesIllinois 14
- 127FlintMichigan 14
- 127Santa BarbaraCalifornia 14
- 135BaltimoreMaryland 14
- 135Fort WayneIndiana 14
- 135Ann Arborlow-cost sensorsMichigan 14
- 135OceansideCalifornia 14
- 139Fort SmithArkansas 14
- 139MiddletownOhio 14
- 139Oklahoma CityOklahoma 14
- 139BrookingsSouth Dakota 14
- 139Agouralow-cost sensorsCalifornia 14
- 139OaklandCalifornia 14
- 145Upper AltonIllinois 14
- 145RockfordIllinois 14
- 145LebanonPennsylvania 14
- 145NipomoCalifornia 14
- 149New AlbanyIndiana 13
- 149LouisvilleKentucky 13
- 149St. LouisMissouri 13
- 149DurhamNorth Carolina 13
- 149HickoryNorth Carolina 13
- 149RaleighNorth Carolina 13
- 149MolineIllinois 13
- 156East Saint LouisIllinois 13
- 156Fort DodgeIowa 13
- 156ClevelandOhio 13
- 156LancasterPennsylvania 13
- 156MilwaukeeWisconsin 13
- 156Mission ViejoCalifornia 13
- 162OwensboroKentucky 13
- 162ColumbiaTennessee 13
- 162AuroraIllinois 13
- 162JolietIllinois 13
- 162ModestoCalifornia 13
- 162San FranciscoCalifornia 13
- 168JeffersonvilleIndiana 13
- 168SteubenvilleOhio 13
- 168WestervilleOhio 13
- 168WaukeshaWisconsin 13
- 168MercedCalifornia 13
- 168SalinasCalifornia 13
- 174Valley StationKentucky 13
- 174GreensboroNorth Carolina 13
- 174PennsaukenNew Jersey 13
- 174BartlettTennessee 13
- 174Cedar RapidsIowa 13
- 174DavenportIowa 13
- 174PerrysburgOhio 13
- 174El CajonCalifornia 13
- 174Great FallsMontana 13
- 183MonroeLouisiana 13
- 183EdmondOklahoma 13
- 183MaryvilleTennessee 13
- 183Encinitaslow-cost sensorsCalifornia 13
- 183MaderaCalifornia 13
- 183PowayCalifornia 13
- 183StocktonCalifornia 13
- 183MidwayFlorida 13
- 191Ferry PassFlorida 13
- 191McDonoughGeorgia 13
- 191Baton RougeLouisiana 13
- 191University CityMissouri 13
- 191AshevilleNorth Carolina 13
- 191ClarksvilleTennessee 13
- 191NapervilleIllinois 13
- 191Oak LawnIllinois 13
- 191ToledoOhio 13
- 200Kendale LakesFlorida 12
- 200Ponte Vedra BeachFlorida 12
- 200IndianapolisIndiana 12
- 200SpringfieldMissouri 12
- 200NorwoodOhio 12
- 200McAlesterOklahoma 12
- 200West MifflinPennsylvania 12
- 200GlendoraCalifornia 12
- 200San Luis ObispoCalifornia 12
- 209WilmingtonDelaware 12
- 209GulfportMississippi 12
- 209HernandoMississippi 12
- 209East ChicagoIndiana 12
- 209ElkhartIndiana 12
- 209Bay CityMichigan 12
- 209DetroitMichigan 12
- 209New York CityNew York 12
- 209OregonOhio 12
- 209PhoenixArizona 12
- 209TucsonArizona 12
- 209Lake ElsinoreCalifornia 12
- 221JeffersontownKentucky 12
- 221Live OakTexas 12
- 221Grand RapidsMichigan 12
- 221MadisonWisconsin 12
- 221Casa GrandeArizona 12
- 221San JoseCalifornia 12
- 227WashingtonDistrict of Columbia 12
- 227OcalaFlorida 12
- 227VeniceFlorida 12
- 227BrunswickGeorgia 12
- 227EssexMaryland 12
- 227LawtonOklahoma 12
- 227AustinTexas 12
- 227HoustonTexas 12
- 227CharlestonWest Virginia 12
- 227AnkenyIowa 12
- 227Des MoinesIowa 12
- 227ChampaignIllinois 12
- 227MinneapolisMinnesota 12
- 240PrichardAlabama 12
- 240DecaturIllinois 12
- 240BloomingtonIndiana 12
- 240JasperIndiana 12
- 240LemayMissouri 12
- 240ClaytonNorth Carolina 12
- 240CookevilleTennessee 12
- 240ConroeTexas 12
- 240HuntingtonWest Virginia 12
- 240South BendIndiana 12
- 240DearbornMichigan 12
- 240Lincoln ParkMichigan 12
- 240MankatoMinnesota 12
- 240HarrisburgPennsylvania 12
- 240RichmondCalifornia 12
- 240Santa ClaritaCalifornia 12
- 240Arden-ArcadeCalifornia 12
- 257St. PetersburgFlorida 12
- 257ElizabethtownKentucky 12
- 257JacksonTennessee 12
- 257San AntonioTexas 12
- 257ChesapeakeVirginia 12
- 257Michigan CityIndiana 12
- 257KalamazooMichigan 12
- 257ElizabethNew Jersey 12
- 257Jersey CityNew Jersey 12
- 257AppletonWisconsin 12
- 257NampaIdaho 12
- 268TampaFlorida 12
- 268Saint MatthewsKentucky 12
- 268Kansas CityMissouri 12
- 268ConwaySouth Carolina 12
- 268CharlottesvilleVirginia 12
- 268SpringfieldVirginia 12
- 268JenisonMichigan 12
- 268Saint PaulMinnesota 12
- 268Fort LeeNew Jersey 12
- 268CarlislePennsylvania 12
- 268San LeandroCalifornia 12
- 268WoodlandCalifornia 12
- 280Oak RidgeFlorida 11
- 280Palm CityFlorida 11
- 280SpringfieldIllinois 11
- 280PascagoulaMississippi 11
- 280KingsportTennessee 11
- 280RichmondVirginia 11
- 280CaryIllinois 11
- 280PatersonNew Jersey 11
- 280WatertownSouth Dakota 11
- 280Green BayWisconsin 11
- 280MantecaCalifornia 11
- 291Bonita SpringsFlorida 11
- 291Fort LauderdaleFlorida 11
- 291MiamiFlorida 11
- 291LeawoodKansas 11
- 291GreenvilleNorth Carolina 11
- 291Toms RiverNew Jersey 11
- 291PasadenaTexas 11
- 291HopewellVirginia 11
- 291ReadingPennsylvania 11
- 291Middletonlow-cost sensorsWisconsin 11
- 291ClovisCalifornia 11
- 291Simi ValleyCalifornia 11
- 303JacksonvilleFlorida 11
- 303ValricoFlorida 11
- 303New OrleansLouisiana 11
- 303RaymoreMissouri 11
- 303Roanoke RapidsNorth Carolina 11
- 303ColumbusOhio 11
- 303ChesterPennsylvania 11
- 303New HavenConnecticut 11
- 303BloomingtonIllinois 11
- 303South MilwaukeeWisconsin 11
- 303MesaArizona 11
- 303TurlockCalifornia 11
- 315LansingMichigan 11
- 315BurnsvilleMinnesota 11
- 315BuffaloNew York 11
- 315NorristownPennsylvania 11
- 315Arroyo GrandeCalifornia 11
- 315Florinlow-cost sensorsCalifornia 11
- 321PaducahKentucky 11
- 321KennerLouisiana 11
- 321ArnoldMissouri 11
- 321South VinelandNew Jersey 11
- 321Fort WorthTexas 11
- 321AshburnVirginia 11
- 321MuncieIndiana 11
- 321EastpointeMichigan 11
- 321Port HuronMichigan 11
- 321EwingNew Jersey 11
- 321RutlandVermont 11
- 321BridgeportConnecticut 11
- 321Goletalow-cost sensorsCalifornia 11
- 321Apache JunctionArizona 11
- 321LewistonIdaho 11
- 336Daytona BeachFlorida 11
- 336CincinnatiOhio 11
- 336DyersburgTennessee 11
- 336East HamptonVirginia 11
- 336Short PumpVirginia 11
- 336BlaineMinnesota 11
- 336DublinOhio 11
- 336WarrenOhio 11
- 336PaysonArizona 11
- 345Pompano BeachFlorida 11
- 345Lexington-FayetteKentucky 11
- 345NicholasvilleKentucky 11
- 345ChalmetteLouisiana 11
- 345DaytonOhio 11
- 345RoanokeVirginia 11
- 345SalemVirginia 11
- 345SouthfieldMichigan 11
- 345YpsilantiMichigan 11
- 345LindenNew Jersey 11
- 345Eau ClaireWisconsin 11
- 345TempeArizona 11
- 345BerkeleyCalifornia 11
- 345SacramentoCalifornia 11
- 345La Crescenta-Montroselow-cost sensorsCalifornia 11
- 360Hunt ValleyMaryland 10
- 360Rose HillVirginia 10
- 360AndersonIndiana 10
- 360RochesterMinnesota 10
- 360AlbanyNew York 10
- 360HolbrookNew York 10
- 360CantonOhio 10
- 360PittsburghPennsylvania 10
- 360GlendaleArizona 10
- 369Belle GladeFlorida 10
- 369Fruit CoveFlorida 10
- 369OrlandoFlorida 10
- 369West PensacolaFlorida 10
- 369DanburyConnecticut 10
- 369Cleveland HeightsOhio 10
- 369NorthbrookIllinois 10
- 369TaylorMichigan 10
- 369ShakopeeMinnesota 10
- 369MedinaOhio 10
- 369WilkinsburgPennsylvania 10
- 369YumaArizona 10
- 369OxnardCalifornia 10
- 369RenoNevada 10
- 383Fort MyersFlorida 10
- 383GainesvilleFlorida 10
- 383SewellNew Jersey 10
- 383MasonOhio 10
- 383College StationTexas 10
- 383CorsicanaTexas 10
- 383Mission BendTexas 10
- 383FillmoreCalifornia 10
- 383OrcuttCalifornia 10
- 383Dodge CityKansas 10
- 383GreeleyColorado 10
- 383MillcreekUtah 10
- 383AnchorageAlaska 10
- 383Four CornersFlorida 10
- 397BearDelaware 10
- 397Safety HarborFlorida 10
- 397ScaggsvilleMaryland 10
- 397ZionIllinois 10
- 397Apple ValleyMinnesota 10
- 397AkronOhio 10
- 397AllentownPennsylvania 10
- 397JohnstownPennsylvania 10
- 397SuperiorWisconsin 10
- 397DavisCalifornia 10
- 397UkiahCalifornia 10
- 408LibertyMissouri 10
- 408SaginawTexas 10
- 408WaterburyConnecticut 10
- 408PortlandMaine 10
- 408La VistaNebraska 10
- 408PainesvilleOhio 10
- 408YoungstownOhio 10
- 408WeirtonWest Virginia 10
- 416FairhopeAlabama 10
- 416DoverDelaware 10
- 416Deerfield BeachFlorida 10
- 416Lake MaryFlorida 10
- 416Palm BayFlorida 10
- 416SarasotaFlorida 10
- 416EdgewoodMaryland 10
- 416ElktonMaryland 10
- 416SpringfieldOhio 10
- 416Port ArthurTexas 10
- 416TaylorTexas 10
- 416HartfordConnecticut 10
- 416SpringfieldMassachusetts 10
- 416Saint MichaelMinnesota 10
- 416BellevueNebraska 10
- 416LincolnNebraska 10
- 416Shaker HeightsOhio 10
- 416EriePennsylvania 10
- 416Santa CruzCalifornia 10
- 416Yuba CityCalifornia 10
- 416Las VegasNevada 10
- 437Delray BeachFlorida 10
- 437San MarcosTexas 10
- 437State CollegePennsylvania 10
- 437BrawleyCalifornia 10
- 437El CentroCalifornia 10
- 437IndioCalifornia 10
- 437RosevilleCalifornia 10
- 437MedfordOregon 10
- 445DavieFlorida 9
- 445WellingtonFlorida 9
- 445White OakOhio 9
- 445HollandMichigan 9
- 445ScrantonPennsylvania 9
- 445LubbockTexas 9
- 445Oxon Hill-GlassmanorMaryland 9
- 452NewarkDelaware 9
- 452East LakeFlorida 9
- 452La PorteTexas 9
- 452Saint CloudMinnesota 9
- 452OmahaNebraska 9
- 452BayonneNew Jersey 9
- 452RochesterNew York 9
- 452Casas AdobesArizona 9
- 452MaranaArizona 9
- 452GaltCalifornia 9
- 452WindsorColorado 9
- 463WestonFlorida 9
- 463LafayetteLouisiana 9
- 463Atlantic CityNew Jersey 9
- 463LebanonOhio 9
- 463LancasterCalifornia 9
- 463AlbuquerqueNew Mexico 9
- 463Rio RanchoNew Mexico 9
- 463West Valley CityUtah 9
- 471Fort ThomasKentucky 9
- 471PflugervilleTexas 9
- 471FraminghamMassachusetts 9
- 471HermitagePennsylvania 9
- 471McKeesportPennsylvania 9
- 471Upper Saint ClairPennsylvania 9
- 471Weirton HeightsWest Virginia 9
- 471LivermoreCalifornia 9
- 471Redwood CityCalifornia 9
- 471AltamontOregon 9
- 481BeltonTexas 9
- 481GalvestonTexas 9
- 481West FargoNorth Dakota 9
- 481VallejoCalifornia 9
- 481RandolphNew Jersey 9
- 486Cedar ParkTexas 9
- 486New LondonConnecticut 9
- 486BostonMassachusetts 9
- 486GreenfieldMassachusetts 9
- 486DuluthMinnesota 9
- 486UticaNew York 9
- 486Picnic Point-North LynnwoodWashington 9
- 493Coconut CreekFlorida 9
- 493South LaurelMaryland 9
- 493Fall RiverMassachusetts 9
- 493HaverhillMassachusetts 9
- 493LynnMassachusetts 9
- 493KeeneNew Hampshire 9
- 493NewburghNew York 9
- 493BanningCalifornia 9
- 493LincolnCalifornia 9
- 493Las CrucesNew Mexico 9
- 503TrentonNew Jersey 8
- 503GahannaOhio 8
- 503AltoonaPennsylvania 8
- 503GilroyCalifornia 8
- 503TemeculaCalifornia 8
- 503HermistonOregon 8
- 503YakimaWashington 8
- 510BrocktonMassachusetts 8
- 510ProvidenceRhode Island 8
- 510PleasantonCalifornia 8
- 510Thousand OaksCalifornia 8
- 510TracyCalifornia 8
- 515LowellMassachusetts 8
- 515WorcesterMassachusetts 8
- 515SyracuseNew York 8
- 515South San Franciscolow-cost sensorsCalifornia 8
- 515Cedar CityUtah 8
- 515OremUtah 8
- 515Columbia CityWashington 8
- 522RockvilleMaryland 8
- 522LimaOhio 8
- 522AberdeenSouth Dakota 8
- 522San RafaelCalifornia 8
- 522Seasidelow-cost sensorsCalifornia 8
- 522West JordanUtah 8
- 522HonoluluHawaii 8
- 529QuincyMassachusetts 8
- 529HollisterCalifornia 8
- 529ThorntonColorado 8
- 529Spring ValleyNevada 8
- 529BillingsMontana 8
- 529Salt Lake CityUtah 8
- 529Spanish ForkUtah 8
- 536HueytownAlabama 8
- 536PittsfieldMassachusetts 8
- 536White PlainsNew York 8
- 536ConcordCalifornia 8
- 536Grand JunctionColorado 8
- 541PleasantvilleNew Jersey 8
- 541PuebloColorado 8
- 541Fort CollinsColorado 8
- 544North ChicopeeMassachusetts 7
- 544LewistonMaine 7
- 544PortsmouthNew Hampshire 7
- 544ChicoCalifornia 7
- 544FolsomCalifornia 7
- 544Coeur d'AleneIdaho 7
- 544BozemanMontana 7
- 544Grants PassOregon 7
- 544AuburnWashington 7
- 544SeattleWashington 7
- 544SunnysideWashington 7
- 555AugustaMaine 7
- 555New CityNew York 7
- 555ReddingCalifornia 7
- 555HillsboroOregon 7
- 555HighlandUtah 7
- 555VancouverWashington 7
- 561Grand IslandNebraska 7
- 561Sioux FallsSouth Dakota 7
- 561Santa RosaCalifornia 7
- 561PocatelloIdaho 7
- 561ButteMontana 7
- 561Rapid CitySouth Dakota 7
- 567HagerstownMaryland 7
- 567MilfordMassachusetts 7
- 567BangorMaine 7
- 567AtascaderoCalifornia 7
- 567RidgecrestCalifornia 7
- 567VacavilleCalifornia 7
- 567Spanish SpringsNevada 7
- 567TigardOregon 7
- 567TacomaWashington 7
- 576HendersonNevada 7
- 576Twin FallsIdaho 7
- 578DerryNew Hampshire 7
- 578Lakewoodlow-cost sensorsColorado 7
- 578Idaho FallsIdaho 7
- 578MoscowIdaho 7
- 578HelenaMontana 7
- 578BountifulUtah 7
- 578MagnaUtah 7
- 578RentonWashington 7
- 586LaconiaNew Hampshire 7
- 586Windsorlow-cost sensorsCalifornia 7
- 586LongmontColorado 7
- 586AshlandOregon 7
- 590ParadiseCalifornia 6
- 590DenverColorado 6
- 590Ken CarylColorado 6
- 590EnterpriseNevada 6
- 590CanbyOregon 6
- 590HerrimanUtah 6
- 590EllensburgWashington 6
- 590LaceyWashington 6
- 590SpokaneWashington 6
- 590WenatcheeWashington 6
- 600Lexingtonlow-cost sensorsMassachusetts 6
- 600Carson CityNevada 6
- 600HurricaneUtah 6
- 600BellinghamWashington 6
- 600KīheiHawaii 6
- 605MarquetteMichigan 6
- 605Colorado SpringsColorado 6
- 605EugeneOregon 6
- 605TooeleUtah 6
- 605Spokane ValleyWashington 6
- 610Arvadalow-cost sensorsColorado 6
- 610MesquiteNevada 6
- 610Brigham CityUtah 6
- 613Boulder CityNevada 6
- 613GreshamOregon 6
- 613MilwaukieOregon 6
- 613The DallesOregon 6
- 613North OgdenUtah 6
- 613Summerlin SouthNevada 6
- 613Tri-CitiesWashington 6
- 620AlbanyOregon 6
- 620PortlandOregon 6
- 620WoodburnOregon 6
- 623Newtonlow-cost sensorsMassachusetts 6
- 623TruckeeCalifornia 6
- 623Cañon CityColorado 6
- 623RoseburgOregon 6
- 623SalemOregon 6
- 623HiloHawaii 6
- 629LompocCalifornia 5
- 629Oregon CityOregon 5
- 629Salmon CreekWashington 5
- 629KahuluiHawaii 5
- 633Green ValleyArizona 5
- 633MartinezCalifornia 5
- 633BeavertonOregon 5
- 633Coos BayOregon 5
- 633BurienWashington 5
- 633LongviewWashington 5
- 633Moses LakeWashington 5
- 633ShorelineWashington 5
- 641Palo Altolow-cost sensorsCalifornia 5
- 641PendletonOregon 5
- 641BremertonWashington 5
- 644BoulderColorado 5
- 644BoiseIdaho 5
- 644DallasOregon 5
- 647BendOregon 5
- 647CentraliaWashington 5
- 647ParklandWashington 5
- 647GilletteWyoming 5
- 647LaramieWyoming 5
- 647Rock SpringsWyoming 5
- 653RedmondOregon 5
- 654MissoulaMontana 4
- 654Walla WallaWashington 4
- 656CoventryRhode Island 4
- 656Forest GroveOregon 4
- 658AberdeenWashington 4
- 658KentWashington 4
- 660CorvallisOregon 4
- 660CheyenneWyoming 4
- 662PullmanWashington 4
- 663Oak HarborWashington 4
- 664McMinnvilleOregon 3
- 665BellevueWashington 3
- 665CasperWyoming 3
- 667Mount VernonWashington 2
- 668AnacortesWashington 2
- 668Union Hill-Novelty Hilllow-cost sensorsWashington 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, March 2026 · United States now
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SmogRank, most polluted cities in United States, PM2.5, March 2026, smogrank.com/us/history/2026-03 (accessed 2 Oct 2026).
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