SmogRank / Episodes / United States

North-eastern United States, 4 to 5 July 2025

For 2 days, from 4 to 5 July 2025, 57 cities in the United States had PM2.5 at least twice their usual for the time of year. The worst reading was Elmwood Park, Illinois, United States: 73.7 µg/m³ on 4 July, about 7.2× its usual 10.3.

Likely Independence Day fireworksIt came on 4 and 5 July, when fireworks smoke fills the air over many US cities at once.
Cities reached57in 1 country
Days24 to 5 July 2025
Worst day5 July46 cities counted
Furthest above usual7.2×Elmwood Park

Day by day

5 July 46 cities at twice their usual or more
CharlestonHuntingtonAshlandPortsmouthGahannaColumbusDublinWeirtonWeirton HeightsAkronMedinaMcKeesportRoanokeKingsportLebanonShaker HeightsCleveland HeightsMasonHermitageFort ThomasPainesvilleLexington-FayetteHarrisonburgLimaNicholasvilleJohnstownWinston-SalemClemmonsHickoryOregonToledoCharlottesvilleAshevilleLexingtonGreensboroChathamErieWindsorLincoln ParkDetroitTaylorKnoxvilleDearbornEastpointeCharlotteYpsilantiMaryvilleSt. ThomasSpartanburgDurhamHagerstownLondonPort HuronGreenvilleSarniaAndersonColumbusValley StationMorrisvilleState CollegeShort PumpElizabethtownRaleighBrantfordRichmondRockvilleClaytonCookevilleKitchenerKokomoCarlisleHamiltonHopewellLansingRoanoke RapidsWaterdownFayettevilleBloomingtonScaggsvilleGuelphSouth LaurelSaint AndrewsSt. CatharinesMiltonOakvilleHarrisburgGainesvilleMississaugaYorkFlorenceKalamazooBaltimoreBay CityBramptonJasperChattanoogaSouth BendTorontoLafayetteEdgewoodGreenvilleLebanonOwensboroLancasterHendersonvilleWyomingGrand RapidsJenisonEast HamptonChesapeakeHollandMichigan CityRochesterElktonReadingNewarkBearDoverGaryWilmingtonColumbiaEast ChicagoHammondCalumet CityChesterDoltonNorristownScrantonBethlehemChicagoChampaignSewellPhiladelphiaOak LawnSouth VinelandBrookfieldDecaturFranklin ParkJolietBensalemNorthbrookDes PlainesSyracuseNapervilleZionEwingTrentonPaducahAuroraPleasantvilleElginDecaturCaryAtlantic CitySouth MilwaukeeRandolphMilwaukeeBloomingtonNew BrunswickToms RiverWaukeshaElizabethPatersonJersey CityNew York CitySpringfieldOconomowocFort LeeNew CityPeoriaRockfordNewburghDyersburgWhite PlainsGranite CitySt. LouisLemayUniversity CityDanburyMadisonAlbanyBridgeportClintonWaterburyNew HavenMolinePittsfieldHernandoDavenportHartfordMuscatineSpringfieldNorth ChicopeeGreenfieldNew LondonRutlandIowa CityKeeneCedar RapidsCoventryWorcesterWake ForestSteubenvilleEast RidgeClevelandElkhartSpringfieldBridgeviewCantonWilkinsburgWest MifflinPortageUpper AltonJeffersontownEvansvillePittsburghWestervilleTerre HautePennsaukenSaint MatthewsYoungstownMuncieEast Saint LouisEssexRose HillMiddletownHuntsvilleFort WayneBuffaloNorwoodSouthfieldAllentownAltoonaPerrysburgNashvilleJeffersonvilleLindenWarrenCincinnatiArnoldOxon Hill-GlassmanorJacksonHunt ValleyRedfordAshburnWest MemphisNew AlbanyFishersLouisvilleHolbrookClarksvilleDaytonSpringfieldIndianapolisWhite OakUticaWashingtonElmwood Park
1 Jul2345678
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

Elmwood ParkElmwood Park, 1 July: 7.6 µg/m³Elmwood Park, 2 July: 14.2 µg/m³Elmwood Park, 3 July: 11.2 µg/m³Elmwood Park, 4 July: 73.7 µg/m³, 7.2× its usual 10.3Elmwood Park, 5 July: 24.3 µg/m³Elmwood Park, 6 July: 8.6 µg/m³Elmwood Park, 7 July: 16.9 µg/m³Elmwood Park, 8 July: 20.3 µg/m³WashingtonWashington, 1 July: 11.1 µg/m³Washington, 2 July: 6.5 µg/m³Washington, 3 July: 8.8 µg/m³Washington, 4 July: 48.8 µg/m³, 5.2× its usual 9.4Washington, 5 July: 66.2 µg/m³, 7.1× its usual 9.3Washington, 6 July: 9.7 µg/m³Washington, 7 July: 8.7 µg/m³Washington, 8 July: 10.6 µg/m³ClarksvilleClarksville, 1 July: 5.1 µg/m³Clarksville, 2 July: 6.7 µg/m³Clarksville, 3 July: 8.5 µg/m³Clarksville, 4 July: 40.6 µg/m³, 5.2× its usual 7.8Clarksville, 5 July: 35.1 µg/m³, 4.4× its usual 7.9Clarksville, 6 July: 10.5 µg/m³Clarksville, 7 July: no readingClarksville, 8 July: no readingWarrenWarren, 1 July: 6.7 µg/m³Warren, 2 July: 9.9 µg/m³Warren, 3 July: 17.7 µg/m³Warren, 4 July: 40.6 µg/m³, 4.0× its usual 10.1Warren, 5 July: 39.5 µg/m³, 4.0× its usual 10.0Warren, 6 July: 17.6 µg/m³Warren, 7 July: 10.2 µg/m³Warren, 8 July: 13.1 µg/m³MiddletownMiddletown, 1 July: 6.5 µg/m³Middletown, 2 July: 9.8 µg/m³Middletown, 3 July: 17.3 µg/m³Middletown, 4 July: 38.6 µg/m³, 3.4× its usual 11.2Middletown, 5 July: 36.3 µg/m³, 3.2× its usual 11.5Middletown, 6 July: 18.8 µg/m³Middletown, 7 July: 11.9 µg/m³Middletown, 8 July: 10.2 µg/m³AshburnAshburn, 1 July: 8.4 µg/m³Ashburn, 2 July: 6.0 µg/m³Ashburn, 3 July: 8.9 µg/m³Ashburn, 4 July: 36.5 µg/m³, 4.6× its usual 8.0Ashburn, 5 July: 35.2 µg/m³, 4.5× its usual 7.9Ashburn, 6 July: 10.0 µg/m³Ashburn, 7 July: 8.9 µg/m³Ashburn, 8 July: 8.8 µg/m³LindenLinden, 1 July: 10.9 µg/m³Linden, 2 July: 9.4 µg/m³Linden, 3 July: 14.2 µg/m³Linden, 4 July: 36.3 µg/m³, 4.0× its usual 9.1Linden, 5 July: 19.3 µg/m³Linden, 6 July: 15.0 µg/m³Linden, 7 July: 10.3 µg/m³Linden, 8 July: 9.7 µg/m³UticaUtica, 1 July: 3.4 µg/m³Utica, 2 July: 2.1 µg/m³Utica, 3 July: 10.7 µg/m³Utica, 4 July: 35.9 µg/m³, 6.6× its usual 5.4Utica, 5 July: 12.2 µg/m³Utica, 6 July: 11.4 µg/m³Utica, 7 July: 6.7 µg/m³Utica, 8 July: 1.0 µg/m³NorwoodNorwood, 1 July: 6.0 µg/m³Norwood, 2 July: 9.7 µg/m³Norwood, 3 July: 14.7 µg/m³Norwood, 4 July: 35.0 µg/m³, 3.2× its usual 11.0Norwood, 5 July: 38.2 µg/m³, 3.5× its usual 11.0Norwood, 6 July: 17.0 µg/m³Norwood, 7 July: 12.0 µg/m³Norwood, 8 July: 11.3 µg/m³East Saint LouisEast Saint Louis, 1 July: 7.1 µg/m³East Saint Louis, 2 July: 12.5 µg/m³East Saint Louis, 3 July: 16.7 µg/m³East Saint Louis, 4 July: 33.8 µg/m³, 3.3× its usual 10.3East Saint Louis, 5 July: 22.4 µg/m³East Saint Louis, 6 July: 13.0 µg/m³East Saint Louis, 7 July: 9.2 µg/m³East Saint Louis, 8 July: 11.2 µg/m³ArnoldArnold, 1 July: 6.0 µg/m³Arnold, 2 July: 11.5 µg/m³Arnold, 3 July: 10.6 µg/m³Arnold, 4 July: 33.2 µg/m³, 4.3× its usual 7.7Arnold, 5 July: 27.3 µg/m³, 3.4× its usual 8.1Arnold, 6 July: 9.3 µg/m³Arnold, 7 July: 7.2 µg/m³Arnold, 8 July: 6.0 µg/m³Hunt ValleyHunt Valley, 1 July: 3.8 µg/m³Hunt Valley, 2 July: 3.8 µg/m³Hunt Valley, 3 July: 4.9 µg/m³Hunt Valley, 4 July: 32.6 µg/m³, 4.5× its usual 7.3Hunt Valley, 5 July: 10.0 µg/m³Hunt Valley, 6 July: 4.8 µg/m³Hunt Valley, 7 July: 1.1 µg/m³Hunt Valley, 8 July: 4.2 µg/m³Oxon Hill-GlassmanorOxon Hill-Glassmanor, 1 July: 10.7 µg/m³Oxon Hill-Glassmanor, 2 July: 6.6 µg/m³Oxon Hill-Glassmanor, 3 July: 8.7 µg/m³Oxon Hill-Glassmanor, 4 July: 30.2 µg/m³, 4.0× its usual 7.6Oxon Hill-Glassmanor, 5 July: 32.7 µg/m³, 4.4× its usual 7.5Oxon Hill-Glassmanor, 6 July: 7.9 µg/m³Oxon Hill-Glassmanor, 7 July: 7.2 µg/m³Oxon Hill-Glassmanor, 8 July: 9.3 µg/m³FishersFishers, 1 July: 8.2 µg/m³Fishers, 2 July: 10.3 µg/m³Fishers, 3 July: 12.6 µg/m³Fishers, 4 July: 28.9 µg/m³, 2.6× its usual 11.0Fishers, 5 July: 51.9 µg/m³, 4.8× its usual 10.9Fishers, 6 July: 15.1 µg/m³Fishers, 7 July: 8.2 µg/m³Fishers, 8 July: 16.2 µg/m³CantonCanton, 1 July: 6.6 µg/m³Canton, 2 July: 8.8 µg/m³Canton, 3 July: 12.4 µg/m³Canton, 4 July: 27.8 µg/m³, 2.6× its usual 10.6Canton, 5 July: 19.9 µg/m³Canton, 6 July: 14.3 µg/m³Canton, 7 July: 9.8 µg/m³Canton, 8 July: 10.1 µg/m³JacksonJackson, 1 July: 6.8 µg/m³Jackson, 2 July: 10.7 µg/m³Jackson, 3 July: 13.3 µg/m³Jackson, 4 July: 27.7 µg/m³, 3.1× its usual 8.9Jackson, 5 July: 38.8 µg/m³, 4.4× its usual 8.9Jackson, 6 July: 11.0 µg/m³Jackson, 7 July: 12.7 µg/m³Jackson, 8 July: 9.1 µg/m³CincinnatiCincinnati, 1 July: 5.5 µg/m³Cincinnati, 2 July: 8.9 µg/m³Cincinnati, 3 July: 13.1 µg/m³Cincinnati, 4 July: 27.7 µg/m³, 2.6× its usual 10.7Cincinnati, 5 July: 44.9 µg/m³, 4.2× its usual 10.8Cincinnati, 6 July: 17.2 µg/m³Cincinnati, 7 July: 12.5 µg/m³Cincinnati, 8 July: 11.7 µg/m³Wake ForestWake Forest, 1 July: 11.7 µg/m³Wake Forest, 2 July: 9.3 µg/m³Wake Forest, 3 July: 14.7 µg/m³Wake Forest, 4 July: 27.5 µg/m³, 2.3× its usual 11.8Wake Forest, 5 July: 25.9 µg/m³, 2.2× its usual 11.9Wake Forest, 6 July: 8.2 µg/m³Wake Forest, 7 July: 14.2 µg/m³Wake Forest, 8 July: 26.3 µg/m³PortagePortage, 1 July: 7.6 µg/m³Portage, 2 July: 14.6 µg/m³Portage, 3 July: 18.2 µg/m³Portage, 4 July: 27.4 µg/m³, 2.9× its usual 9.4Portage, 5 July: 22.4 µg/m³Portage, 6 July: 9.9 µg/m³Portage, 7 July: 12.4 µg/m³Portage, 8 July: 20.0 µg/m³BuffaloBuffalo, 1 July: 7.8 µg/m³Buffalo, 2 July: 8.3 µg/m³Buffalo, 3 July: 11.0 µg/m³Buffalo, 4 July: 27.3 µg/m³, 3.1× its usual 8.8Buffalo, 5 July: 30.6 µg/m³, 3.5× its usual 8.8Buffalo, 6 July: 14.0 µg/m³Buffalo, 7 July: 10.1 µg/m³Buffalo, 8 July: 6.9 µg/m³BridgeviewBridgeview, 1 July: 8.2 µg/m³Bridgeview, 2 July: 15.4 µg/m³Bridgeview, 3 July: 13.4 µg/m³Bridgeview, 4 July: 27.2 µg/m³, 2.6× its usual 10.5Bridgeview, 5 July: 17.8 µg/m³Bridgeview, 6 July: 9.4 µg/m³Bridgeview, 7 July: 20.7 µg/m³Bridgeview, 8 July: 21.9 µg/m³SpringfieldSpringfield, 1 July: 9.2 µg/m³Springfield, 2 July: 5.3 µg/m³Springfield, 3 July: 8.2 µg/m³Springfield, 4 July: 27.0 µg/m³, 3.3× its usual 8.3Springfield, 5 July: 49.3 µg/m³, 6.0× its usual 8.2Springfield, 6 July: 8.5 µg/m³Springfield, 7 July: 7.6 µg/m³Springfield, 8 July: 8.8 µg/m³YoungstownYoungstown, 1 July: 5.9 µg/m³Youngstown, 2 July: 8.6 µg/m³Youngstown, 3 July: 15.5 µg/m³Youngstown, 4 July: 26.4 µg/m³, 3.1× its usual 8.6Youngstown, 5 July: 27.6 µg/m³, 3.2× its usual 8.6Youngstown, 6 July: 15.1 µg/m³Youngstown, 7 July: 9.3 µg/m³Youngstown, 8 July: 10.1 µg/m³West MifflinWest Mifflin, 1 July: 9.4 µg/m³West Mifflin, 2 July: 11.1 µg/m³West Mifflin, 3 July: 15.6 µg/m³West Mifflin, 4 July: 26.4 µg/m³, 2.3× its usual 11.6West Mifflin, 5 July: 30.6 µg/m³, 2.7× its usual 11.5West Mifflin, 6 July: 15.7 µg/m³West Mifflin, 7 July: 13.0 µg/m³West Mifflin, 8 July: 7.3 µg/m³IndianapolisIndianapolis, 1 July: 6.6 µg/m³Indianapolis, 2 July: 11.2 µg/m³Indianapolis, 3 July: 12.6 µg/m³Indianapolis, 4 July: 26.3 µg/m³, 2.4× its usual 10.9Indianapolis, 5 July: 66.3 µg/m³, 6.1× its usual 10.9Indianapolis, 6 July: 14.6 µg/m³Indianapolis, 7 July: 8.7 µg/m³Indianapolis, 8 July: 24.5 µg/m³EssexEssex, 1 July: 7.7 µg/m³Essex, 2 July: 6.1 µg/m³Essex, 3 July: 8.2 µg/m³Essex, 4 July: 26.2 µg/m³, 3.4× its usual 7.6Essex, 5 July: 18.8 µg/m³Essex, 6 July: 9.2 µg/m³Essex, 7 July: 4.9 µg/m³Essex, 8 July: 7.9 µg/m³ClevelandCleveland, 1 July: 6.1 µg/m³Cleveland, 2 July: 10.7 µg/m³Cleveland, 3 July: 19.3 µg/m³Cleveland, 4 July: 25.8 µg/m³, 2.5× its usual 10.5Cleveland, 5 July: 20.8 µg/m³Cleveland, 6 July: 14.0 µg/m³Cleveland, 7 July: 8.2 µg/m³Cleveland, 8 July: 13.2 µg/m³ElkhartElkhart, 1 July: 8.4 µg/m³Elkhart, 2 July: 11.4 µg/m³Elkhart, 3 July: 9.5 µg/m³Elkhart, 4 July: 25.6 µg/m³, 2.6× its usual 10.0Elkhart, 5 July: 17.0 µg/m³Elkhart, 6 July: 10.6 µg/m³Elkhart, 7 July: no readingElkhart, 8 July: no readingDaytonDayton, 1 July: 5.6 µg/m³Dayton, 2 July: 9.3 µg/m³Dayton, 3 July: 12.9 µg/m³Dayton, 4 July: 15.7 µg/m³Dayton, 5 July: 54.1 µg/m³, 5.5× its usual 9.9Dayton, 6 July: 15.2 µg/m³Dayton, 7 July: 9.1 µg/m³Dayton, 8 July: 10.8 µg/m³LouisvilleLouisville, 1 July: 5.9 µg/m³Louisville, 2 July: 9.0 µg/m³Louisville, 3 July: 13.6 µg/m³Louisville, 4 July: 22.6 µg/m³Louisville, 5 July: 45.7 µg/m³, 4.9× its usual 9.3Louisville, 6 July: 14.6 µg/m³Louisville, 7 July: 11.2 µg/m³Louisville, 8 July: 10.7 µg/m³West MemphisWest Memphis, 1 July: 5.4 µg/m³West Memphis, 2 July: 10.7 µg/m³West Memphis, 3 July: 14.2 µg/m³West Memphis, 4 July: 20.0 µg/m³West Memphis, 5 July: 45.6 µg/m³, 4.6× its usual 10.0West Memphis, 6 July: 16.1 µg/m³West Memphis, 7 July: 12.6 µg/m³West Memphis, 8 July: 12.7 µg/m³RedfordRedford, 1 July: 7.7 µg/m³Redford, 2 July: 10.0 µg/m³Redford, 3 July: 12.6 µg/m³Redford, 4 July: 22.1 µg/m³Redford, 5 July: 45.2 µg/m³, 4.5× its usual 10.1Redford, 6 July: 13.9 µg/m³Redford, 7 July: 4.9 µg/m³Redford, 8 July: 16.3 µg/m³White OakWhite Oak, 1 July: 2.9 µg/m³White Oak, 2 July: 5.8 µg/m³White Oak, 3 July: 7.7 µg/m³White Oak, 4 July: 12.1 µg/m³White Oak, 5 July: 43.5 µg/m³, 6.3× its usual 6.9White Oak, 6 July: 17.7 µg/m³White Oak, 7 July: 6.7 µg/m³White Oak, 8 July: 6.4 µg/m³PerrysburgPerrysburg, 1 July: 8.1 µg/m³Perrysburg, 2 July: 12.1 µg/m³Perrysburg, 3 July: 11.5 µg/m³Perrysburg, 4 July: 19.9 µg/m³Perrysburg, 5 July: 38.6 µg/m³, 3.7× its usual 10.5Perrysburg, 6 July: 17.2 µg/m³Perrysburg, 7 July: 7.5 µg/m³Perrysburg, 8 July: 17.7 µg/m³New AlbanyNew Albany, 1 July: 2.5 µg/m³New Albany, 2 July: 5.2 µg/m³New Albany, 3 July: 12.1 µg/m³New Albany, 4 July: 19.7 µg/m³New Albany, 5 July: 36.1 µg/m³, 4.7× its usual 7.7New Albany, 6 July: 12.9 µg/m³New Albany, 7 July: 7.5 µg/m³New Albany, 8 July: 7.3 µg/m³HolbrookHolbrook, 1 July: 7.5 µg/m³Holbrook, 2 July: 4.8 µg/m³Holbrook, 3 July: 10.1 µg/m³Holbrook, 4 July: 19.2 µg/m³Holbrook, 5 July: 33.7 µg/m³, 5.1× its usual 6.6Holbrook, 6 July: 11.4 µg/m³Holbrook, 7 July: 7.6 µg/m³Holbrook, 8 July: 9.2 µg/m³JeffersonvilleJeffersonville, 1 July: 4.9 µg/m³Jeffersonville, 2 July: 8.8 µg/m³Jeffersonville, 3 July: 11.4 µg/m³Jeffersonville, 4 July: 19.3 µg/m³Jeffersonville, 5 July: 33.7 µg/m³, 3.9× its usual 8.7Jeffersonville, 6 July: 12.1 µg/m³Jeffersonville, 7 July: 9.1 µg/m³Jeffersonville, 8 July: 10.7 µg/m³Terre HauteTerre Haute, 1 July: 4.8 µg/m³Terre Haute, 2 July: 9.5 µg/m³Terre Haute, 3 July: 16.4 µg/m³Terre Haute, 4 July: 23.5 µg/m³Terre Haute, 5 July: 32.0 µg/m³, 3.0× its usual 10.7Terre Haute, 6 July: 13.7 µg/m³Terre Haute, 7 July: 11.4 µg/m³Terre Haute, 8 July: 18.9 µg/m³WestervilleWesterville, 1 July: 7.0 µg/m³Westerville, 2 July: 9.3 µg/m³Westerville, 3 July: 12.3 µg/m³Westerville, 4 July: 19.6 µg/m³Westerville, 5 July: 31.8 µg/m³, 3.0× its usual 10.6Westerville, 6 July: 20.6 µg/m³Westerville, 7 July: 12.1 µg/m³Westerville, 8 July: 10.0 µg/m³MuncieMuncie, 1 July: 5.9 µg/m³Muncie, 2 July: 9.4 µg/m³Muncie, 3 July: 12.3 µg/m³Muncie, 4 July: 24.3 µg/m³Muncie, 5 July: 30.2 µg/m³, 3.3× its usual 9.1Muncie, 6 July: 13.8 µg/m³Muncie, 7 July: 4.5 µg/m³Muncie, 8 July: 13.7 µg/m³AllentownAllentown, 1 July: 4.9 µg/m³Allentown, 2 July: 6.1 µg/m³Allentown, 3 July: 10.4 µg/m³Allentown, 4 July: 15.5 µg/m³Allentown, 5 July: 29.8 µg/m³, 3.6× its usual 8.2Allentown, 6 July: 12.5 µg/m³Allentown, 7 July: 5.4 µg/m³Allentown, 8 July: 5.9 µg/m³AltoonaAltoona, 1 July: 7.2 µg/m³Altoona, 2 July: 10.1 µg/m³Altoona, 3 July: 14.4 µg/m³Altoona, 4 July: 24.1 µg/m³Altoona, 5 July: 29.7 µg/m³, 3.7× its usual 8.1Altoona, 6 July: 19.7 µg/m³Altoona, 7 July: 13.1 µg/m³Altoona, 8 July: 8.4 µg/m³NashvilleNashville, 1 July: 5.9 µg/m³Nashville, 2 July: 8.4 µg/m³Nashville, 3 July: 11.4 µg/m³Nashville, 4 July: 18.0 µg/m³Nashville, 5 July: 29.3 µg/m³, 3.8× its usual 7.7Nashville, 6 July: 13.6 µg/m³Nashville, 7 July: 9.1 µg/m³Nashville, 8 July: 7.5 µg/m³PittsburghPittsburgh, 1 July: 7.1 µg/m³Pittsburgh, 2 July: 8.4 µg/m³Pittsburgh, 3 July: 12.1 µg/m³Pittsburgh, 4 July: 20.3 µg/m³Pittsburgh, 5 July: 28.7 µg/m³, 3.0× its usual 9.6Pittsburgh, 6 July: 14.0 µg/m³Pittsburgh, 7 July: 11.6 µg/m³Pittsburgh, 8 July: 5.9 µg/m³SouthfieldSouthfield, 1 July: 5.0 µg/m³Southfield, 2 July: 9.4 µg/m³Southfield, 3 July: 13.1 µg/m³Southfield, 4 July: 19.4 µg/m³Southfield, 5 July: 28.6 µg/m³, 3.6× its usual 8.0Southfield, 6 July: 11.8 µg/m³Southfield, 7 July: 4.2 µg/m³Southfield, 8 July: 16.8 µg/m³EvansvilleEvansville, 1 July: 5.4 µg/m³Evansville, 2 July: 9.3 µg/m³Evansville, 3 July: 13.8 µg/m³Evansville, 4 July: 24.0 µg/m³Evansville, 5 July: 28.6 µg/m³, 3.0× its usual 9.4Evansville, 6 July: 14.3 µg/m³Evansville, 7 July: 7.2 µg/m³Evansville, 8 July: 12.9 µg/m³PennsaukenPennsauken, 1 July: 8.1 µg/m³Pennsauken, 2 July: 8.6 µg/m³Pennsauken, 3 July: 13.2 µg/m³Pennsauken, 4 July: 16.4 µg/m³Pennsauken, 5 July: 28.2 µg/m³, 3.1× its usual 9.1Pennsauken, 6 July: 10.6 µg/m³Pennsauken, 7 July: 7.9 µg/m³Pennsauken, 8 July: 9.3 µg/m³Fort WayneFort Wayne, 1 July: 6.3 µg/m³Fort Wayne, 2 July: 11.1 µg/m³Fort Wayne, 3 July: 10.9 µg/m³Fort Wayne, 4 July: 14.2 µg/m³Fort Wayne, 5 July: 27.9 µg/m³, 3.5× its usual 7.9Fort Wayne, 6 July: 13.5 µg/m³Fort Wayne, 7 July: 6.2 µg/m³Fort Wayne, 8 July: 18.2 µg/m³Saint MatthewsSaint Matthews, 1 July: 5.0 µg/m³Saint Matthews, 2 July: 8.1 µg/m³Saint Matthews, 3 July: 11.3 µg/m³Saint Matthews, 4 July: 14.7 µg/m³Saint Matthews, 5 July: 27.0 µg/m³, 3.2× its usual 8.4Saint Matthews, 6 July: 13.2 µg/m³Saint Matthews, 7 July: 9.4 µg/m³Saint Matthews, 8 July: 9.8 µg/m³Rose HillRose Hill, 1 July: 8.5 µg/m³Rose Hill, 2 July: 5.1 µg/m³Rose Hill, 3 July: 8.0 µg/m³Rose Hill, 4 July: 17.9 µg/m³Rose Hill, 5 July: 26.8 µg/m³, 3.4× its usual 7.9Rose Hill, 6 July: 8.4 µg/m³Rose Hill, 7 July: 6.3 µg/m³Rose Hill, 8 July: 8.5 µg/m³HuntsvilleHuntsville, 1 July: 5.8 µg/m³Huntsville, 2 July: 6.9 µg/m³Huntsville, 3 July: 10.6 µg/m³Huntsville, 4 July: 16.2 µg/m³Huntsville, 5 July: 26.2 µg/m³, 3.5× its usual 7.5Huntsville, 6 July: 13.4 µg/m³Huntsville, 7 July: 13.3 µg/m³Huntsville, 8 July: 10.5 µg/m³SpringfieldSpringfield, 1 July: 5.2 µg/m³Springfield, 2 July: 8.5 µg/m³Springfield, 3 July: 14.2 µg/m³Springfield, 4 July: 23.7 µg/m³Springfield, 5 July: 26.0 µg/m³, 2.6× its usual 10.1Springfield, 6 July: 14.1 µg/m³Springfield, 7 July: 8.9 µg/m³Springfield, 8 July: 12.2 µg/m³JeffersontownJeffersontown, 1 July: 5.0 µg/m³Jeffersontown, 2 July: 8.7 µg/m³Jeffersontown, 3 July: 12.0 µg/m³Jeffersontown, 4 July: 20.5 µg/m³Jeffersontown, 5 July: 25.9 µg/m³, 3.0× its usual 8.7Jeffersontown, 6 July: 14.5 µg/m³Jeffersontown, 7 July: 9.4 µg/m³Jeffersontown, 8 July: 10.6 µg/m³WilkinsburgWilkinsburg, 1 July: 7.8 µg/m³Wilkinsburg, 2 July: 8.5 µg/m³Wilkinsburg, 3 July: 13.1 µg/m³Wilkinsburg, 4 July: 19.8 µg/m³Wilkinsburg, 5 July: 25.5 µg/m³, 2.7× its usual 9.4Wilkinsburg, 6 July: 12.3 µg/m³Wilkinsburg, 7 July: 10.9 µg/m³Wilkinsburg, 8 July: 6.1 µg/m³Upper AltonUpper Alton, 1 July: 6.8 µg/m³Upper Alton, 2 July: 11.7 µg/m³Upper Alton, 3 July: 13.9 µg/m³Upper Alton, 4 July: 22.4 µg/m³Upper Alton, 5 July: 25.4 µg/m³, 3.0× its usual 8.6Upper Alton, 6 July: 11.4 µg/m³Upper Alton, 7 July: 8.6 µg/m³Upper Alton, 8 July: 12.6 µg/m³East RidgeEast Ridge, 1 July: 7.8 µg/m³East Ridge, 2 July: 7.1 µg/m³East Ridge, 3 July: 11.7 µg/m³East Ridge, 4 July: 22.0 µg/m³East Ridge, 5 July: 25.3 µg/m³, 2.5× its usual 10.0East Ridge, 6 July: 16.7 µg/m³East Ridge, 7 July: 15.4 µg/m³East Ridge, 8 July: 13.6 µg/m³SteubenvilleSteubenville, 1 July: 8.8 µg/m³Steubenville, 2 July: 10.6 µg/m³Steubenville, 3 July: 14.4 µg/m³Steubenville, 4 July: 23.7 µg/m³Steubenville, 5 July: 25.3 µg/m³, 2.5× its usual 10.0Steubenville, 6 July: 18.1 µg/m³Steubenville, 7 July: 12.9 µg/m³Steubenville, 8 July: 8.1 µg/m³1 Jul2345678
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
Elmwood ParkIllinois, United States1 73.74 July10.37.2×
WashingtonDistrict of Columbia, United States2 66.25 July9.37.1×
UticaNew York, United States1 35.94 July5.46.6×
White OakOhio, United States1 43.55 July6.96.3×
IndianapolisIndiana, United States2 66.35 July10.96.1×
SpringfieldVirginia, United States2 49.35 July8.26.0×
DaytonOhio, United States1 54.15 July9.95.5×
ClarksvilleTennessee, United States2 40.64 July7.85.2×
HolbrookNew York, United States1 33.75 July6.65.1×
LouisvilleKentucky, United States1 45.75 July9.34.9×
FishersIndiana, United States2 51.95 July10.94.8×
New AlbanyIndiana, United States1 36.15 July7.74.7×
West MemphisArkansas, United States1 45.65 July10.04.6×
AshburnVirginia, United States2 36.54 July8.04.6×
RedfordMichigan, United States1 45.25 July10.14.5×
Hunt ValleyMaryland, United States1 32.64 July7.34.5×
JacksonTennessee, United States2 38.85 July8.94.4×
Oxon Hill-GlassmanorMaryland, United States2 32.75 July7.54.4×
ArnoldMissouri, United States2 33.24 July7.74.3×
CincinnatiOhio, United States2 44.95 July10.84.2×
WarrenOhio, United States2 40.64 July10.14.0×
LindenNew Jersey, United States1 36.34 July9.14.0×
JeffersonvilleIndiana, United States1 33.75 July8.73.9×
NashvilleTennessee, United States1 29.35 July7.73.8×
PerrysburgOhio, United States1 38.65 July10.53.7×
AltoonaPennsylvania, United States1 29.75 July8.13.7×
AllentownPennsylvania, United States1 29.85 July8.23.6×
SouthfieldMichigan, United States1 28.65 July8.03.6×
NorwoodOhio, United States2 38.25 July11.03.5×
BuffaloNew York, United States2 30.65 July8.83.5×
Fort WayneIndiana, United States1 27.95 July7.93.5×
HuntsvilleAlabama, United States1 26.25 July7.53.5×
MiddletownOhio, United States2 38.64 July11.23.4×
Rose HillVirginia, United States1 26.85 July7.93.4×
EssexMaryland, United States1 26.24 July7.63.4×
East Saint LouisIllinois, United States1 33.84 July10.33.3×
MuncieIndiana, United States1 30.25 July9.13.3×
YoungstownOhio, United States2 27.65 July8.63.2×
Saint MatthewsKentucky, United States1 27.05 July8.43.2×
PennsaukenNew Jersey, United States1 28.25 July9.13.1×
Terre HauteIndiana, United States1 32.05 July10.73.0×
WestervilleOhio, United States1 31.85 July10.63.0×
PittsburghPennsylvania, United States1 28.75 July9.63.0×
EvansvilleIndiana, United States1 28.65 July9.43.0×
JeffersontownKentucky, United States1 25.95 July8.73.0×
Upper AltonIllinois, United States1 25.45 July8.63.0×
PortageIndiana, United States1 27.44 July9.42.9×
West MifflinPennsylvania, United States2 30.65 July11.52.7×
WilkinsburgPennsylvania, United States1 25.55 July9.42.7×
CantonOhio, United States1 27.84 July10.62.6×
BridgeviewIllinois, United States1 27.24 July10.52.6×
SpringfieldOhio, United States1 26.05 July10.12.6×
ElkhartIndiana, United States1 25.64 July10.02.6×
ClevelandOhio, United States1 25.84 July10.52.5×
East RidgeTennessee, United States1 25.35 July10.02.5×
SteubenvilleOhio, United States1 25.35 July10.02.5×
Wake ForestNorth Carolina, United States2 27.54 July11.82.3×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in the United States

Number 18 of 130 episodes in the United States since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 130.

Use this page

SmogRank, North-eastern United States, 4 to 5 July 2025: 57 cities with PM2.5 at twice their usual or more, 4 to 5 July 2025, smogrank.com/episodes/2025-07-04-north-eastern-united-states (accessed 4 October 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.