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
- 1South Lake TahoeCalifornia 95
- 2CalexicoCalifornia 78
- 3Delanolow-cost sensorsCalifornia 70
- 4Tularelow-cost sensorsCalifornia 66
- 5AlbanyGeorgia 64
- 6MaconGeorgia 63
- 7Jurupa ValleyCalifornia 62
- 8PortervilleCalifornia 62
- 9BadgerAlaska 62
- 10RedfordMichigan 61
- 11BakersfieldCalifornia 61
- 11VisaliaCalifornia 61
- 13ColumbusGeorgia 60
- 13WhittierCalifornia 60
- 15AugustaGeorgia 59
- 15ChattanoogaTennessee 59
- 15El PasoTexas 59
- 18Hawthornelow-cost sensorsCalifornia 59
- 19Inglewoodlow-cost sensorsCalifornia 58
- 20WichitaKansas 58
- 21RiversideCalifornia 58
- 22Royal Oaklow-cost sensorsMichigan 58
- 22Los AngelesCalifornia 58
- 22Pasadenalow-cost sensorsCalifornia 58
- 25TallahasseeFlorida 58
- 25Wake Forestlow-cost sensorsNorth Carolina 58
- 25LaredoTexas 58
- 25FontanaCalifornia 58
- 29AthensGeorgia 58
- 30GadsdenAlabama 57
- 31Warner RobinsGeorgia 57
- 32MontgomeryAlabama 57
- 32Carsonlow-cost sensorsCalifornia 57
- 32ComptonCalifornia 57
- 32Candler-McAfeeGeorgia 57
- 36BrookfieldIllinois 57
- 37Santa Monicalow-cost sensorsCalifornia 57
- 38SocorroTexas 56
- 39OdessaTexas 56
- 40SpartanburgSouth Carolina 56
- 41East RidgeTennessee 56
- 41CorcoranCalifornia 56
- 41Huntington Beachlow-cost sensorsCalifornia 56
- 44ValdostaGeorgia 56
- 44Skokielow-cost sensorsIllinois 56
- 46Torrancelow-cost sensorsCalifornia 55
- 47DerbyKansas 55
- 47TopekaKansas 55
- 47Nileslow-cost sensorsIllinois 55
- 47FresnoCalifornia 55
- 51SpringdaleArkansas 55
- 51FairbanksAlaska 55
- 53AnaheimCalifornia 55
- 54BessemerAlabama 55
- 54TulsaOklahoma 55
- 56Ponca CityOklahoma 55
- 57Camdenlow-cost sensorsNew Jersey 54
- 57WaterlooIowa 54
- 57Evanstonlow-cost sensorsIllinois 54
- 57San DiegoCalifornia 54
- 61LawrencevilleGeorgia 54
- 61JacksonMississippi 54
- 61North CharlestonSouth Carolina 54
- 64BirminghamAlabama 54
- 64MissionTexas 54
- 64Blue Islandlow-cost sensorsIllinois 54
- 64Evergreen Parklow-cost sensorsIllinois 54
- 68HuntsvilleAlabama 54
- 68SavannahGeorgia 54
- 68FlorenceSouth Carolina 54
- 68GreenvilleSouth Carolina 54
- 68HanfordCalifornia 54
- 68Long BeachCalifornia 54
- 68Eagle PassTexas 54
- 75West MemphisArkansas 54
- 75MuscatineIowa 54
- 75BridgeviewIllinois 54
- 75Chula VistaCalifornia 54
- 79TrussvilleAlabama 53
- 79AshlandKentucky 53
- 79PhiladelphiaPennsylvania 53
- 82Little RockArkansas 53
- 82GainesvilleGeorgia 53
- 82Winston-SalemNorth Carolina 53
- 82WyomingMichigan 53
- 82Lomitalow-cost sensorsCalifornia 53
- 87AtlantaGeorgia 53
- 87CharlotteNorth Carolina 53
- 87Saint AndrewsSouth Carolina 53
- 87TexarkanaTexas 53
- 87Franklin ParkIllinois 53
- 87Brookfieldlow-cost sensorsWisconsin 53
- 87HobbsNew Mexico 53
- 94Granite CityIllinois 53
- 94HattiesburgMississippi 53
- 94Corpus ChristiTexas 53
- 94Abingtonlow-cost sensorsPennsylvania 53
- 94NogalesArizona 53
- 99DecaturAlabama 53
- 99ShreveportLouisiana 53
- 99BurbankCalifornia 53
- 102Saint JosephMissouri 52
- 102ClemmonsNorth Carolina 52
- 102LexingtonNorth Carolina 52
- 102MorrisvilleNorth Carolina 52
- 102JenksOklahoma 52
- 102ClintonIowa 52
- 102ElginIllinois 52
- 109MooreOklahoma 52
- 109KnoxvilleTennessee 52
- 109NashvilleTennessee 52
- 109Calumet CityIllinois 52
- 113OlatheKansas 52
- 113Columbialow-cost sensorsMissouri 52
- 113PortsmouthOhio 52
- 113HendersonvilleTennessee 52
- 113DoltonIllinois 52
- 113Oconomowoclow-cost sensorsWisconsin 52
- 119EvansvilleIndiana 52
- 119FayettevilleNorth Carolina 52
- 119BaytownTexas 52
- 119Iowa CityIowa 52
- 119Elmwood ParkIllinois 52
- 119PeoriaIllinois 52
- 119HammondIndiana 52
- 119Sunland ParkNew Mexico 52
- 127Kansas CityKansas 52
- 127YorkPennsylvania 52
- 127BrownsvilleTexas 52
- 127EdinburgTexas 52
- 127ChicagoIllinois 52
- 127Des PlainesIllinois 52
- 127FlintMichigan 52
- 127Santa BarbaraCalifornia 52
- 135BaltimoreMaryland 52
- 135Fort WayneIndiana 52
- 135Ann Arborlow-cost sensorsMichigan 52
- 135OceansideCalifornia 52
- 139Fort SmithArkansas 51
- 139MiddletownOhio 51
- 139Oklahoma CityOklahoma 51
- 139BrookingsSouth Dakota 51
- 139Agouralow-cost sensorsCalifornia 51
- 139OaklandCalifornia 51
- 145Upper AltonIllinois 51
- 145RockfordIllinois 51
- 145LebanonPennsylvania 51
- 145NipomoCalifornia 51
- 149New AlbanyIndiana 51
- 149LouisvilleKentucky 51
- 149St. LouisMissouri 51
- 149DurhamNorth Carolina 51
- 149HickoryNorth Carolina 51
- 149RaleighNorth Carolina 51
- 149MolineIllinois 51
- 156East Saint LouisIllinois 50
- 156Fort DodgeIowa 50
- 156ClevelandOhio 50
- 156LancasterPennsylvania 50
- 156MilwaukeeWisconsin 50
- 156Mission ViejoCalifornia 50
- 162OwensboroKentucky 49
- 162ColumbiaTennessee 49
- 162AuroraIllinois 49
- 162JolietIllinois 49
- 162ModestoCalifornia 49
- 162San FranciscoCalifornia 49
- 168JeffersonvilleIndiana 49
- 168SteubenvilleOhio 49
- 168WestervilleOhio 49
- 168WaukeshaWisconsin 49
- 168MercedCalifornia 49
- 168SalinasCalifornia 49
- 174Valley StationKentucky 48
- 174GreensboroNorth Carolina 48
- 174PennsaukenNew Jersey 48
- 174BartlettTennessee 48
- 174Cedar RapidsIowa 48
- 174DavenportIowa 48
- 174PerrysburgOhio 48
- 174El CajonCalifornia 48
- 174Great FallsMontana 48
- 183MonroeLouisiana 48
- 183EdmondOklahoma 48
- 183MaryvilleTennessee 48
- 183Encinitaslow-cost sensorsCalifornia 48
- 183MaderaCalifornia 48
- 183PowayCalifornia 48
- 183StocktonCalifornia 48
- 183MidwayFlorida 48
- 191Ferry PassFlorida 47
- 191McDonoughGeorgia 47
- 191Baton RougeLouisiana 47
- 191University CityMissouri 47
- 191AshevilleNorth Carolina 47
- 191ClarksvilleTennessee 47
- 191NapervilleIllinois 47
- 191Oak LawnIllinois 47
- 191ToledoOhio 47
- 200Kendale LakesFlorida 47
- 200Ponte Vedra BeachFlorida 47
- 200IndianapolisIndiana 47
- 200SpringfieldMissouri 47
- 200NorwoodOhio 47
- 200McAlesterOklahoma 47
- 200West MifflinPennsylvania 47
- 200GlendoraCalifornia 47
- 200San Luis ObispoCalifornia 47
- 209WilmingtonDelaware 46
- 209GulfportMississippi 46
- 209HernandoMississippi 46
- 209East ChicagoIndiana 46
- 209ElkhartIndiana 46
- 209Bay CityMichigan 46
- 209DetroitMichigan 46
- 209New York CityNew York 46
- 209OregonOhio 46
- 209PhoenixArizona 46
- 209TucsonArizona 46
- 209Lake ElsinoreCalifornia 46
- 221JeffersontownKentucky 46
- 221Live OakTexas 46
- 221Grand RapidsMichigan 46
- 221MadisonWisconsin 46
- 221Casa GrandeArizona 46
- 221San JoseCalifornia 46
- 227WashingtonDistrict of Columbia 45
- 227OcalaFlorida 45
- 227VeniceFlorida 45
- 227BrunswickGeorgia 45
- 227EssexMaryland 45
- 227LawtonOklahoma 45
- 227AustinTexas 45
- 227HoustonTexas 45
- 227CharlestonWest Virginia 45
- 227AnkenyIowa 45
- 227Des MoinesIowa 45
- 227ChampaignIllinois 45
- 227MinneapolisMinnesota 45
- 240PrichardAlabama 44
- 240DecaturIllinois 44
- 240BloomingtonIndiana 44
- 240JasperIndiana 44
- 240LemayMissouri 44
- 240ClaytonNorth Carolina 44
- 240CookevilleTennessee 44
- 240ConroeTexas 44
- 240HuntingtonWest Virginia 44
- 240South BendIndiana 44
- 240DearbornMichigan 44
- 240Lincoln ParkMichigan 44
- 240MankatoMinnesota 44
- 240HarrisburgPennsylvania 44
- 240RichmondCalifornia 44
- 240Santa ClaritaCalifornia 44
- 240Arden-ArcadeCalifornia 44
- 257St. PetersburgFlorida 44
- 257ElizabethtownKentucky 44
- 257JacksonTennessee 44
- 257San AntonioTexas 44
- 257ChesapeakeVirginia 44
- 257Michigan CityIndiana 44
- 257KalamazooMichigan 44
- 257ElizabethNew Jersey 44
- 257Jersey CityNew Jersey 44
- 257AppletonWisconsin 44
- 257NampaIdaho 44
- 268TampaFlorida 43
- 268Saint MatthewsKentucky 43
- 268Kansas CityMissouri 43
- 268ConwaySouth Carolina 43
- 268CharlottesvilleVirginia 43
- 268SpringfieldVirginia 43
- 268JenisonMichigan 43
- 268Saint PaulMinnesota 43
- 268Fort LeeNew Jersey 43
- 268CarlislePennsylvania 43
- 268San LeandroCalifornia 43
- 268WoodlandCalifornia 43
- 280Oak RidgeFlorida 43
- 280Palm CityFlorida 43
- 280SpringfieldIllinois 43
- 280PascagoulaMississippi 43
- 280KingsportTennessee 43
- 280RichmondVirginia 43
- 280CaryIllinois 43
- 280PatersonNew Jersey 43
- 280WatertownSouth Dakota 43
- 280Green BayWisconsin 43
- 280MantecaCalifornia 43
- 291Bonita SpringsFlorida 42
- 291Fort LauderdaleFlorida 42
- 291MiamiFlorida 42
- 291LeawoodKansas 42
- 291GreenvilleNorth Carolina 42
- 291Toms RiverNew Jersey 42
- 291PasadenaTexas 42
- 291HopewellVirginia 42
- 291ReadingPennsylvania 42
- 291Middletonlow-cost sensorsWisconsin 42
- 291ClovisCalifornia 42
- 291Simi ValleyCalifornia 42
- 303JacksonvilleFlorida 42
- 303ValricoFlorida 42
- 303New OrleansLouisiana 42
- 303RaymoreMissouri 42
- 303Roanoke RapidsNorth Carolina 42
- 303ColumbusOhio 42
- 303ChesterPennsylvania 42
- 303New HavenConnecticut 42
- 303BloomingtonIllinois 42
- 303South MilwaukeeWisconsin 42
- 303MesaArizona 42
- 303TurlockCalifornia 42
- 315LansingMichigan 41
- 315BurnsvilleMinnesota 41
- 315BuffaloNew York 41
- 315NorristownPennsylvania 41
- 315Arroyo GrandeCalifornia 41
- 315Florinlow-cost sensorsCalifornia 41
- 321PaducahKentucky 41
- 321KennerLouisiana 41
- 321ArnoldMissouri 41
- 321South VinelandNew Jersey 41
- 321Fort WorthTexas 41
- 321AshburnVirginia 41
- 321MuncieIndiana 41
- 321EastpointeMichigan 41
- 321Port HuronMichigan 41
- 321EwingNew Jersey 41
- 321RutlandVermont 41
- 321BridgeportConnecticut 41
- 321Goletalow-cost sensorsCalifornia 41
- 321Apache JunctionArizona 41
- 321LewistonIdaho 41
- 336Daytona BeachFlorida 40
- 336CincinnatiOhio 40
- 336DyersburgTennessee 40
- 336East HamptonVirginia 40
- 336Short PumpVirginia 40
- 336BlaineMinnesota 40
- 336DublinOhio 40
- 336WarrenOhio 40
- 336PaysonArizona 40
- 345Pompano BeachFlorida 39
- 345Lexington-FayetteKentucky 39
- 345NicholasvilleKentucky 39
- 345ChalmetteLouisiana 39
- 345DaytonOhio 39
- 345RoanokeVirginia 39
- 345SalemVirginia 39
- 345SouthfieldMichigan 39
- 345YpsilantiMichigan 39
- 345LindenNew Jersey 39
- 345Eau ClaireWisconsin 39
- 345TempeArizona 39
- 345BerkeleyCalifornia 39
- 345SacramentoCalifornia 39
- 345La Crescenta-Montroselow-cost sensorsCalifornia 39
- 360Hunt ValleyMaryland 39
- 360Rose HillVirginia 39
- 360AndersonIndiana 39
- 360RochesterMinnesota 39
- 360AlbanyNew York 39
- 360HolbrookNew York 39
- 360CantonOhio 39
- 360PittsburghPennsylvania 39
- 360GlendaleArizona 39
- 369Belle GladeFlorida 38
- 369Fruit CoveFlorida 38
- 369OrlandoFlorida 38
- 369West PensacolaFlorida 38
- 369DanburyConnecticut 38
- 369Cleveland HeightsOhio 38
- 369NorthbrookIllinois 38
- 369TaylorMichigan 38
- 369ShakopeeMinnesota 38
- 369MedinaOhio 38
- 369WilkinsburgPennsylvania 38
- 369YumaArizona 38
- 369OxnardCalifornia 38
- 369RenoNevada 38
- 383Fort MyersFlorida 38
- 383GainesvilleFlorida 38
- 383SewellNew Jersey 38
- 383MasonOhio 38
- 383College StationTexas 38
- 383CorsicanaTexas 38
- 383Mission BendTexas 38
- 383FillmoreCalifornia 38
- 383OrcuttCalifornia 38
- 383Dodge CityKansas 38
- 383GreeleyColorado 38
- 383MillcreekUtah 38
- 383AnchorageAlaska 38
- 383Four CornersFlorida 38
- 397BearDelaware 37
- 397Safety HarborFlorida 37
- 397ScaggsvilleMaryland 37
- 397ZionIllinois 37
- 397Apple ValleyMinnesota 37
- 397AkronOhio 37
- 397AllentownPennsylvania 37
- 397JohnstownPennsylvania 37
- 397SuperiorWisconsin 37
- 397DavisCalifornia 37
- 397UkiahCalifornia 37
- 408LibertyMissouri 37
- 408SaginawTexas 37
- 408WaterburyConnecticut 37
- 408PortlandMaine 37
- 408La VistaNebraska 37
- 408PainesvilleOhio 37
- 408YoungstownOhio 37
- 408WeirtonWest Virginia 37
- 416FairhopeAlabama 36
- 416DoverDelaware 36
- 416Deerfield BeachFlorida 36
- 416Lake MaryFlorida 36
- 416Palm BayFlorida 36
- 416SarasotaFlorida 36
- 416EdgewoodMaryland 36
- 416ElktonMaryland 36
- 416SpringfieldOhio 36
- 416Port ArthurTexas 36
- 416TaylorTexas 36
- 416HartfordConnecticut 36
- 416SpringfieldMassachusetts 36
- 416Saint MichaelMinnesota 36
- 416BellevueNebraska 36
- 416LincolnNebraska 36
- 416Shaker HeightsOhio 36
- 416EriePennsylvania 36
- 416Santa CruzCalifornia 36
- 416Yuba CityCalifornia 36
- 416Las VegasNevada 36
- 437Delray BeachFlorida 36
- 437San MarcosTexas 36
- 437State CollegePennsylvania 36
- 437BrawleyCalifornia 36
- 437El CentroCalifornia 36
- 437IndioCalifornia 36
- 437RosevilleCalifornia 36
- 437MedfordOregon 36
- 445DavieFlorida 35
- 445WellingtonFlorida 35
- 445White OakOhio 35
- 445HollandMichigan 35
- 445ScrantonPennsylvania 35
- 445LubbockTexas 35
- 445Oxon Hill-GlassmanorMaryland 35
- 452NewarkDelaware 34
- 452East LakeFlorida 34
- 452La PorteTexas 34
- 452Saint CloudMinnesota 34
- 452OmahaNebraska 34
- 452BayonneNew Jersey 34
- 452RochesterNew York 34
- 452Casas AdobesArizona 34
- 452MaranaArizona 34
- 452GaltCalifornia 34
- 452WindsorColorado 34
- 463WestonFlorida 34
- 463LafayetteLouisiana 34
- 463Atlantic CityNew Jersey 34
- 463LebanonOhio 34
- 463LancasterCalifornia 34
- 463AlbuquerqueNew Mexico 34
- 463Rio RanchoNew Mexico 34
- 463West Valley CityUtah 34
- 471Fort ThomasKentucky 33
- 471PflugervilleTexas 33
- 471FraminghamMassachusetts 33
- 471HermitagePennsylvania 33
- 471McKeesportPennsylvania 33
- 471Upper Saint ClairPennsylvania 33
- 471Weirton HeightsWest Virginia 33
- 471LivermoreCalifornia 33
- 471Redwood CityCalifornia 33
- 471AltamontOregon 33
- 481BeltonTexas 33
- 481GalvestonTexas 33
- 481West FargoNorth Dakota 33
- 481VallejoCalifornia 33
- 481RandolphNew Jersey 33
- 486Cedar ParkTexas 32
- 486New LondonConnecticut 32
- 486BostonMassachusetts 32
- 486GreenfieldMassachusetts 32
- 486DuluthMinnesota 32
- 486UticaNew York 32
- 486Picnic Point-North LynnwoodWashington 32
- 493Coconut CreekFlorida 32
- 493South LaurelMaryland 32
- 493Fall RiverMassachusetts 32
- 493HaverhillMassachusetts 32
- 493LynnMassachusetts 32
- 493KeeneNew Hampshire 32
- 493NewburghNew York 32
- 493BanningCalifornia 32
- 493LincolnCalifornia 32
- 493Las CrucesNew Mexico 32
- 503TrentonNew Jersey 31
- 503GahannaOhio 31
- 503AltoonaPennsylvania 31
- 503GilroyCalifornia 31
- 503TemeculaCalifornia 31
- 503HermistonOregon 31
- 503YakimaWashington 31
- 510BrocktonMassachusetts 31
- 510ProvidenceRhode Island 31
- 510PleasantonCalifornia 31
- 510Thousand OaksCalifornia 31
- 510TracyCalifornia 31
- 515LowellMassachusetts 30
- 515WorcesterMassachusetts 30
- 515SyracuseNew York 30
- 515South San Franciscolow-cost sensorsCalifornia 30
- 515Cedar CityUtah 30
- 515OremUtah 30
- 515Columbia CityWashington 30
- 522RockvilleMaryland 29
- 522LimaOhio 29
- 522AberdeenSouth Dakota 29
- 522San RafaelCalifornia 29
- 522Seasidelow-cost sensorsCalifornia 29
- 522West JordanUtah 29
- 522HonoluluHawaii 29
- 529QuincyMassachusetts 29
- 529HollisterCalifornia 29
- 529ThorntonColorado 29
- 529Spring ValleyNevada 29
- 529BillingsMontana 29
- 529Salt Lake CityUtah 29
- 529Spanish ForkUtah 29
- 536HueytownAlabama 28
- 536PittsfieldMassachusetts 28
- 536White PlainsNew York 28
- 536ConcordCalifornia 28
- 536Grand JunctionColorado 28
- 541PleasantvilleNew Jersey 28
- 541PuebloColorado 28
- 541Fort CollinsColorado 28
- 544North ChicopeeMassachusetts 27
- 544LewistonMaine 27
- 544PortsmouthNew Hampshire 27
- 544ChicoCalifornia 27
- 544FolsomCalifornia 27
- 544Coeur d'AleneIdaho 27
- 544BozemanMontana 27
- 544Grants PassOregon 27
- 544AuburnWashington 27
- 544SeattleWashington 27
- 544SunnysideWashington 27
- 555AugustaMaine 27
- 555New CityNew York 27
- 555ReddingCalifornia 27
- 555HillsboroOregon 27
- 555HighlandUtah 27
- 555VancouverWashington 27
- 561Grand IslandNebraska 26
- 561Sioux FallsSouth Dakota 26
- 561Santa RosaCalifornia 26
- 561PocatelloIdaho 26
- 561ButteMontana 26
- 561Rapid CitySouth Dakota 26
- 567HagerstownMaryland 26
- 567MilfordMassachusetts 26
- 567BangorMaine 26
- 567AtascaderoCalifornia 26
- 567RidgecrestCalifornia 26
- 567VacavilleCalifornia 26
- 567Spanish SpringsNevada 26
- 567TigardOregon 26
- 567TacomaWashington 26
- 576HendersonNevada 25
- 576Twin FallsIdaho 25
- 578DerryNew Hampshire 24
- 578Lakewoodlow-cost sensorsColorado 24
- 578Idaho FallsIdaho 24
- 578MoscowIdaho 24
- 578HelenaMontana 24
- 578BountifulUtah 24
- 578MagnaUtah 24
- 578RentonWashington 24
- 586LaconiaNew Hampshire 24
- 586Windsorlow-cost sensorsCalifornia 24
- 586LongmontColorado 24
- 586AshlandOregon 24
- 590ParadiseCalifornia 23
- 590DenverColorado 23
- 590Ken CarylColorado 23
- 590EnterpriseNevada 23
- 590CanbyOregon 23
- 590HerrimanUtah 23
- 590EllensburgWashington 23
- 590LaceyWashington 23
- 590SpokaneWashington 23
- 590WenatcheeWashington 23
- 600Lexingtonlow-cost sensorsMassachusetts 23
- 600Carson CityNevada 23
- 600HurricaneUtah 23
- 600BellinghamWashington 23
- 600KīheiHawaii 23
- 605MarquetteMichigan 22
- 605Colorado SpringsColorado 22
- 605EugeneOregon 22
- 605TooeleUtah 22
- 605Spokane ValleyWashington 22
- 610Arvadalow-cost sensorsColorado 22
- 610MesquiteNevada 22
- 610Brigham CityUtah 22
- 613Boulder CityNevada 21
- 613GreshamOregon 21
- 613MilwaukieOregon 21
- 613The DallesOregon 21
- 613North OgdenUtah 21
- 613Summerlin SouthNevada 21
- 613Tri-CitiesWashington 21
- 620AlbanyOregon 21
- 620PortlandOregon 21
- 620WoodburnOregon 21
- 623Newtonlow-cost sensorsMassachusetts 20
- 623TruckeeCalifornia 20
- 623Cañon CityColorado 20
- 623RoseburgOregon 20
- 623SalemOregon 20
- 623HiloHawaii 20
- 629LompocCalifornia 19
- 629Oregon CityOregon 19
- 629Salmon CreekWashington 19
- 629KahuluiHawaii 19
- 633Green ValleyArizona 19
- 633MartinezCalifornia 19
- 633BeavertonOregon 19
- 633Coos BayOregon 19
- 633BurienWashington 19
- 633LongviewWashington 19
- 633Moses LakeWashington 19
- 633ShorelineWashington 19
- 641Palo Altolow-cost sensorsCalifornia 18
- 641PendletonOregon 18
- 641BremertonWashington 18
- 644BoulderColorado 18
- 644BoiseIdaho 18
- 644DallasOregon 18
- 647BendOregon 17
- 647CentraliaWashington 17
- 647ParklandWashington 17
- 647GilletteWyoming 17
- 647LaramieWyoming 17
- 647Rock SpringsWyoming 17
- 653RedmondOregon 16
- 654MissoulaMontana 16
- 654Walla WallaWashington 16
- 656CoventryRhode Island 15
- 656Forest GroveOregon 15
- 658AberdeenWashington 14
- 658KentWashington 14
- 660CorvallisOregon 14
- 660CheyenneWyoming 14
- 662PullmanWashington 13
- 663Oak HarborWashington 12
- 664McMinnvilleOregon 11
- 665BellevueWashington 9
- 665CasperWyoming 9
- 667Mount VernonWashington 7
- 668AnacortesWashington 7
- 668Union Hill-Novelty Hilllow-cost sensorsWashington 7
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). 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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