SmogRank / Episodes / United States

North-eastern United States, 4 to 5 July 2023

For 2 days, from 4 to 5 July 2023, 46 cities in the United States had PM2.5 at least twice their usual for the time of year. The worst reading was Bayonne, New Jersey, United States: 56.9 µg/m³ on 5 July, about 11× its usual 5.1.

Likely Independence Day fireworksIt came on 4 and 5 July, when fireworks smoke fills the air over many US cities at once.
Cities reached46in 1 country
Days24 to 5 July 2023
Worst day5 July28 cities counted
Furthest above usual11×Bayonne

Day by day

5 July 28 cities at twice their usual or more
MedinaWheelingAshlandCharlestonSteubenvilleWeirton HeightsShaker HeightsYoungstownPainesvilleDaytonPittsburghHermitageLebanonLimaMcKeesportToledoFort ThomasWhite OakChathamWindsorLincoln ParkDetroitTaylorDearbornYpsilantiLexington-FayetteErieSt. ThomasJohnstownPort HuronSarniaKingsportRoanokeLondonAndersonAltoonaBrantfordColumbusKitchenerFishersCharlottesvilleWinston-SalemHamiltonClemmonsKokomoValley StationState CollegeKalamazooElizabethtownHagerstownGreensboroSt. CatharinesBuffaloKenmoreBloomingtonCheektowagaLafayetteJenisonCarlisleDurhamRockvilleSpringfieldCookevilleHollandRose HillRichmondHarrisburgScaggsvilleSouth LaurelYorkHopewellHunt ValleyOwensboroBaltimoreRoanoke RapidsRochesterLebanonHendersonvilleLancasterCalumet CityEdgewoodReadingElktonJolietNewarkEast HamptonZionBearNapervilleChesapeakeWilmingtonDoverSouth MilwaukeeScrantonAllentownCaryChesterNorristownBethlehemSyracuseDecaturPhiladelphiaWaukeshaBloomingtonPennsaukenSouth VinelandPaducahBensalemEwingTrentonRockfordPleasantvilleSpringfieldUticaNew BrunswickToms RiverPatersonMadisonGranite CityNew CitySt. LouisDyersburgNewburghLemayUniversity CityClintonWhite PlainsArnoldHempsteadMolineDavenportDanburyAlbanyBridgeportHolbrookMuscatineWaterburyPittsfieldNew HavenHartfordFranklin ParkClevelandMiddletownWarrenEast Saint LouisEvansvilleOak LawnSouth BendSpringfieldCincinnatiElkhartCantonMilwaukeeLouisvilleWashingtonGaryTerre HauteWest MifflinSaint MatthewsJeffersontownDublinHammondNorthbrookAkronDes PlainesChicagoIndianapolisMasonClarksvilleNew York CityWilkinsburgGrand RapidsLindenNorwoodJeffersonvilleEast ChicagoGahannaFlintPortageLansingRedfordFort LeeElizabethJersey CityNew AlbanyBayonne
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

PortagePortage, 1 July: 23.3 µg/m³Portage, 2 July: 8.7 µg/m³Portage, 3 July: 10.7 µg/m³Portage, 4 July: 39.0 µg/m³, 4.2× its usual 9.3Portage, 5 July: 16.4 µg/m³Portage, 6 July: 11.8 µg/m³Portage, 7 July: 8.3 µg/m³Portage, 8 July: 6.9 µg/m³IndianapolisIndianapolis, 1 July: 7.3 µg/m³Indianapolis, 2 July: 6.3 µg/m³Indianapolis, 3 July: 11.2 µg/m³Indianapolis, 4 July: 35.6 µg/m³, 3.3× its usual 10.8Indianapolis, 5 July: 33.7 µg/m³, 3.1× its usual 10.8Indianapolis, 6 July: 7.4 µg/m³Indianapolis, 7 July: 11.5 µg/m³Indianapolis, 8 July: 6.5 µg/m³Grand RapidsGrand Rapids, 1 July: 23.9 µg/m³Grand Rapids, 2 July: 14.2 µg/m³Grand Rapids, 3 July: 15.2 µg/m³Grand Rapids, 4 July: 34.6 µg/m³, 3.6× its usual 9.6Grand Rapids, 5 July: 34.8 µg/m³, 3.5× its usual 9.9Grand Rapids, 6 July: 10.4 µg/m³Grand Rapids, 7 July: 9.8 µg/m³Grand Rapids, 8 July: 7.9 µg/m³LansingLansing, 1 July: 19.2 µg/m³Lansing, 2 July: 10.3 µg/m³Lansing, 3 July: 9.1 µg/m³Lansing, 4 July: 33.7 µg/m³, 3.8× its usual 8.8Lansing, 5 July: 37.8 µg/m³, 4.3× its usual 8.8Lansing, 6 July: 7.4 µg/m³Lansing, 7 July: 8.2 µg/m³Lansing, 8 July: 8.0 µg/m³FlintFlint, 1 July: 11.6 µg/m³Flint, 2 July: 6.7 µg/m³Flint, 3 July: 2.8 µg/m³Flint, 4 July: 33.1 µg/m³, 4.2× its usual 7.8Flint, 5 July: 25.6 µg/m³, 3.2× its usual 7.9Flint, 6 July: 3.1 µg/m³Flint, 7 July: 3.2 µg/m³Flint, 8 July: 3.4 µg/m³ChicagoChicago, 1 July: 20.7 µg/m³Chicago, 2 July: 12.9 µg/m³Chicago, 3 July: 12.6 µg/m³Chicago, 4 July: 31.9 µg/m³, 3.3× its usual 9.6Chicago, 5 July: 19.5 µg/m³Chicago, 6 July: 9.3 µg/m³Chicago, 7 July: 10.1 µg/m³Chicago, 8 July: 8.4 µg/m³East ChicagoEast Chicago, 1 July: 19.3 µg/m³East Chicago, 2 July: 5.6 µg/m³East Chicago, 3 July: 11.4 µg/m³East Chicago, 4 July: 31.8 µg/m³, 3.9× its usual 8.1East Chicago, 5 July: 12.2 µg/m³East Chicago, 6 July: 9.5 µg/m³East Chicago, 7 July: 8.1 µg/m³East Chicago, 8 July: 6.9 µg/m³Terre HauteTerre Haute, 1 July: no readingTerre Haute, 2 July: no readingTerre Haute, 3 July: 12.5 µg/m³Terre Haute, 4 July: 31.3 µg/m³, 3.0× its usual 10.4Terre Haute, 5 July: 21.6 µg/m³Terre Haute, 6 July: 7.6 µg/m³Terre Haute, 7 July: 6.7 µg/m³Terre Haute, 8 July: 5.3 µg/m³GahannaGahanna, 1 July: 6.8 µg/m³Gahanna, 2 July: 4.2 µg/m³Gahanna, 3 July: 4.5 µg/m³Gahanna, 4 July: 30.7 µg/m³, 4.0× its usual 7.6Gahanna, 5 July: 17.0 µg/m³Gahanna, 6 July: 7.0 µg/m³Gahanna, 7 July: 5.3 µg/m³Gahanna, 8 July: 5.8 µg/m³HammondHammond, 1 July: 20.0 µg/m³Hammond, 2 July: 5.5 µg/m³Hammond, 3 July: 14.3 µg/m³Hammond, 4 July: 30.4 µg/m³, 3.1× its usual 9.8Hammond, 5 July: 11.0 µg/m³Hammond, 6 July: 10.3 µg/m³Hammond, 7 July: 11.5 µg/m³Hammond, 8 July: 7.1 µg/m³GaryGary, 1 July: 21.4 µg/m³Gary, 2 July: 8.6 µg/m³Gary, 3 July: 9.8 µg/m³Gary, 4 July: 29.0 µg/m³, 3.0× its usual 9.7Gary, 5 July: 19.1 µg/m³Gary, 6 July: 12.1 µg/m³Gary, 7 July: 7.9 µg/m³Gary, 8 July: 8.7 µg/m³Des PlainesDes Plaines, 1 July: 21.0 µg/m³Des Plaines, 2 July: 13.8 µg/m³Des Plaines, 3 July: 13.7 µg/m³Des Plaines, 4 July: 28.7 µg/m³, 3.3× its usual 8.8Des Plaines, 5 July: 23.3 µg/m³Des Plaines, 6 July: 9.6 µg/m³Des Plaines, 7 July: 10.0 µg/m³Des Plaines, 8 July: 7.5 µg/m³ElkhartElkhart, 1 July: 8.9 µg/m³Elkhart, 2 July: 4.0 µg/m³Elkhart, 3 July: 10.9 µg/m³Elkhart, 4 July: 28.6 µg/m³, 2.9× its usual 10.0Elkhart, 5 July: 15.2 µg/m³Elkhart, 6 July: 7.2 µg/m³Elkhart, 7 July: 8.4 µg/m³Elkhart, 8 July: 9.1 µg/m³ClarksvilleClarksville, 1 July: 8.6 µg/m³Clarksville, 2 July: 8.9 µg/m³Clarksville, 3 July: 8.9 µg/m³Clarksville, 4 July: 26.9 µg/m³, 3.5× its usual 7.7Clarksville, 5 July: 7.8 µg/m³Clarksville, 6 July: 6.5 µg/m³Clarksville, 7 July: 8.5 µg/m³Clarksville, 8 July: 7.8 µg/m³South BendSouth Bend, 1 July: 12.6 µg/m³South Bend, 2 July: 5.0 µg/m³South Bend, 3 July: 11.1 µg/m³South Bend, 4 July: 26.3 µg/m³, 2.8× its usual 9.3South Bend, 5 July: 18.1 µg/m³South Bend, 6 July: 9.0 µg/m³South Bend, 7 July: 9.8 µg/m³South Bend, 8 July: 7.6 µg/m³MilwaukeeMilwaukee, 1 July: 19.9 µg/m³Milwaukee, 2 July: 15.4 µg/m³Milwaukee, 3 July: 13.9 µg/m³Milwaukee, 4 July: 26.2 µg/m³, 3.0× its usual 8.8Milwaukee, 5 July: 15.6 µg/m³Milwaukee, 6 July: 11.9 µg/m³Milwaukee, 7 July: 9.0 µg/m³Milwaukee, 8 July: 8.2 µg/m³Oak LawnOak Lawn, 1 July: 16.3 µg/m³Oak Lawn, 2 July: 7.8 µg/m³Oak Lawn, 3 July: 11.7 µg/m³Oak Lawn, 4 July: 26.1 µg/m³, 2.8× its usual 9.4Oak Lawn, 5 July: 17.0 µg/m³Oak Lawn, 6 July: 10.3 µg/m³Oak Lawn, 7 July: 11.4 µg/m³Oak Lawn, 8 July: 7.6 µg/m³East Saint LouisEast Saint Louis, 1 July: no readingEast Saint Louis, 2 July: no readingEast Saint Louis, 3 July: no readingEast Saint Louis, 4 July: 26.1 µg/m³, 2.6× its usual 10.1East Saint Louis, 5 July: 11.3 µg/m³East Saint Louis, 6 July: 9.2 µg/m³East Saint Louis, 7 July: 7.8 µg/m³East Saint Louis, 8 July: 7.1 µg/m³JeffersontownJeffersontown, 1 July: 9.7 µg/m³Jeffersontown, 2 July: 6.2 µg/m³Jeffersontown, 3 July: 11.8 µg/m³Jeffersontown, 4 July: 26.0 µg/m³, 3.1× its usual 8.5Jeffersontown, 5 July: 17.0 µg/m³Jeffersontown, 6 July: 8.4 µg/m³Jeffersontown, 7 July: 9.7 µg/m³Jeffersontown, 8 July: 9.2 µg/m³Saint MatthewsSaint Matthews, 1 July: no readingSaint Matthews, 2 July: no readingSaint Matthews, 3 July: 10.7 µg/m³Saint Matthews, 4 July: 25.6 µg/m³, 3.1× its usual 8.3Saint Matthews, 5 July: 22.4 µg/m³Saint Matthews, 6 July: 8.2 µg/m³Saint Matthews, 7 July: 9.3 µg/m³Saint Matthews, 8 July: 9.5 µg/m³JeffersonvilleJeffersonville, 1 July: 10.1 µg/m³Jeffersonville, 2 July: 6.5 µg/m³Jeffersonville, 3 July: 11.2 µg/m³Jeffersonville, 4 July: 25.3 µg/m³, 2.9× its usual 8.6Jeffersonville, 5 July: 31.8 µg/m³, 3.7× its usual 8.6Jeffersonville, 6 July: 9.3 µg/m³Jeffersonville, 7 July: 10.4 µg/m³Jeffersonville, 8 July: 11.0 µg/m³EvansvilleEvansville, 1 July: 8.4 µg/m³Evansville, 2 July: 6.0 µg/m³Evansville, 3 July: 11.9 µg/m³Evansville, 4 July: 25.3 µg/m³, 2.8× its usual 9.1Evansville, 5 July: 19.1 µg/m³Evansville, 6 July: 7.1 µg/m³Evansville, 7 July: 9.9 µg/m³Evansville, 8 July: 8.8 µg/m³Franklin ParkFranklin Park, 1 July: 19.1 µg/m³Franklin Park, 2 July: 11.4 µg/m³Franklin Park, 3 July: 11.8 µg/m³Franklin Park, 4 July: 25.3 µg/m³, 2.4× its usual 10.5Franklin Park, 5 July: 16.3 µg/m³Franklin Park, 6 July: 9.0 µg/m³Franklin Park, 7 July: 9.2 µg/m³Franklin Park, 8 July: 6.6 µg/m³BayonneBayonne, 1 July: 19.2 µg/m³Bayonne, 2 July: 14.2 µg/m³Bayonne, 3 July: 5.5 µg/m³Bayonne, 4 July: 74.3 µg/m³Bayonne, 5 July: 56.9 µg/m³, 11× its usual 5.1Bayonne, 6 July: 5.7 µg/m³Bayonne, 7 July: 4.9 µg/m³Bayonne, 8 July: 5.7 µg/m³New AlbanyNew Albany, 1 July: 10.9 µg/m³New Albany, 2 July: no readingNew Albany, 3 July: no readingNew Albany, 4 July: 19.4 µg/m³New Albany, 5 July: 49.1 µg/m³, 6.5× its usual 7.6New Albany, 6 July: no readingNew Albany, 7 July: no readingNew Albany, 8 July: 7.1 µg/m³ElizabethElizabeth, 1 July: 32.0 µg/m³Elizabeth, 2 July: 21.5 µg/m³Elizabeth, 3 July: 10.8 µg/m³Elizabeth, 4 July: 12.4 µg/m³Elizabeth, 5 July: 49.0 µg/m³, 4.9× its usual 9.9Elizabeth, 6 July: 16.6 µg/m³Elizabeth, 7 July: 14.9 µg/m³Elizabeth, 8 July: 14.4 µg/m³RedfordRedford, 1 July: 21.1 µg/m³Redford, 2 July: 7.5 µg/m³Redford, 3 July: 6.3 µg/m³Redford, 4 July: 22.5 µg/m³Redford, 5 July: 45.6 µg/m³, 4.4× its usual 10.4Redford, 6 July: 11.1 µg/m³Redford, 7 July: 8.3 µg/m³Redford, 8 July: 8.3 µg/m³Jersey CityJersey City, 1 July: 29.4 µg/m³Jersey City, 2 July: 19.7 µg/m³Jersey City, 3 July: 8.8 µg/m³Jersey City, 4 July: 13.6 µg/m³Jersey City, 5 July: 44.2 µg/m³, 5.0× its usual 8.9Jersey City, 6 July: 12.3 µg/m³Jersey City, 7 July: 10.8 µg/m³Jersey City, 8 July: 11.9 µg/m³NorwoodNorwood, 1 July: 9.7 µg/m³Norwood, 2 July: 6.2 µg/m³Norwood, 3 July: 6.4 µg/m³Norwood, 4 July: 21.3 µg/m³Norwood, 5 July: 41.1 µg/m³, 3.6× its usual 11.3Norwood, 6 July: 12.5 µg/m³Norwood, 7 July: 10.1 µg/m³Norwood, 8 July: 9.3 µg/m³Fort LeeFort Lee, 1 July: 29.9 µg/m³Fort Lee, 2 July: 17.3 µg/m³Fort Lee, 3 July: 7.4 µg/m³Fort Lee, 4 July: 21.9 µg/m³Fort Lee, 5 July: 35.4 µg/m³, 4.6× its usual 7.7Fort Lee, 6 July: 8.3 µg/m³Fort Lee, 7 July: 5.4 µg/m³Fort Lee, 8 July: 7.0 µg/m³LindenLinden, 1 July: 29.2 µg/m³Linden, 2 July: 19.6 µg/m³Linden, 3 July: 7.6 µg/m³Linden, 4 July: 23.6 µg/m³Linden, 5 July: 33.8 µg/m³, 3.6× its usual 9.3Linden, 6 July: 11.6 µg/m³Linden, 7 July: 11.0 µg/m³Linden, 8 July: 11.8 µg/m³West MifflinWest Mifflin, 1 July: 19.0 µg/m³West Mifflin, 2 July: 11.3 µg/m³West Mifflin, 3 July: 12.0 µg/m³West Mifflin, 4 July: 14.2 µg/m³West Mifflin, 5 July: 33.6 µg/m³, 3.0× its usual 11.1West Mifflin, 6 July: 20.1 µg/m³West Mifflin, 7 July: 13.7 µg/m³West Mifflin, 8 July: 11.6 µg/m³WilkinsburgWilkinsburg, 1 July: 13.6 µg/m³Wilkinsburg, 2 July: 10.1 µg/m³Wilkinsburg, 3 July: 6.6 µg/m³Wilkinsburg, 4 July: 17.2 µg/m³Wilkinsburg, 5 July: 32.3 µg/m³, 3.5× its usual 9.3Wilkinsburg, 6 July: 13.6 µg/m³Wilkinsburg, 7 July: 11.7 µg/m³Wilkinsburg, 8 July: 10.5 µg/m³CincinnatiCincinnati, 1 July: 9.2 µg/m³Cincinnati, 2 July: 5.7 µg/m³Cincinnati, 3 July: 5.8 µg/m³Cincinnati, 4 July: 23.4 µg/m³Cincinnati, 5 July: 31.3 µg/m³, 2.8× its usual 11.0Cincinnati, 6 July: 10.9 µg/m³Cincinnati, 7 July: 9.7 µg/m³Cincinnati, 8 July: 8.7 µg/m³New York CityNew York City, 1 July: 33.5 µg/m³New York City, 2 July: 21.7 µg/m³New York City, 3 July: 8.0 µg/m³New York City, 4 July: 21.0 µg/m³New York City, 5 July: 30.6 µg/m³, 3.5× its usual 8.7New York City, 6 July: 10.3 µg/m³New York City, 7 July: 9.3 µg/m³New York City, 8 July: 9.8 µg/m³CantonCanton, 1 July: 13.3 µg/m³Canton, 2 July: 5.9 µg/m³Canton, 3 July: 7.1 µg/m³Canton, 4 July: 22.2 µg/m³Canton, 5 July: 30.1 µg/m³, 2.9× its usual 10.4Canton, 6 July: 15.9 µg/m³Canton, 7 July: 10.1 µg/m³Canton, 8 July: 10.5 µg/m³SpringfieldSpringfield, 1 July: 9.7 µg/m³Springfield, 2 July: 6.0 µg/m³Springfield, 3 July: 5.7 µg/m³Springfield, 4 July: 18.6 µg/m³Springfield, 5 July: 29.1 µg/m³, 2.8× its usual 10.4Springfield, 6 July: 10.3 µg/m³Springfield, 7 July: 8.9 µg/m³Springfield, 8 July: 8.6 µg/m³MasonMason, 1 July: 8.4 µg/m³Mason, 2 July: 5.3 µg/m³Mason, 3 July: 5.3 µg/m³Mason, 4 July: 18.1 µg/m³Mason, 5 July: 28.9 µg/m³, 3.4× its usual 8.5Mason, 6 July: 12.2 µg/m³Mason, 7 July: 8.4 µg/m³Mason, 8 July: 8.3 µg/m³NorthbrookNorthbrook, 1 July: 23.9 µg/m³Northbrook, 2 July: 18.9 µg/m³Northbrook, 3 July: 11.5 µg/m³Northbrook, 4 July: 23.6 µg/m³Northbrook, 5 July: 28.9 µg/m³, 3.2× its usual 8.9Northbrook, 6 July: 10.4 µg/m³Northbrook, 7 July: 9.6 µg/m³Northbrook, 8 July: 7.4 µg/m³MiddletownMiddletown, 1 July: 9.8 µg/m³Middletown, 2 July: 6.3 µg/m³Middletown, 3 July: 7.2 µg/m³Middletown, 4 July: 15.6 µg/m³Middletown, 5 July: 27.7 µg/m³, 2.4× its usual 11.6Middletown, 6 July: 12.7 µg/m³Middletown, 7 July: 11.0 µg/m³Middletown, 8 July: 9.7 µg/m³WashingtonWashington, 1 July: 29.8 µg/m³Washington, 2 July: 13.3 µg/m³Washington, 3 July: 10.5 µg/m³Washington, 4 July: 28.1 µg/m³Washington, 5 July: 27.2 µg/m³, 3.0× its usual 9.1Washington, 6 July: 14.1 µg/m³Washington, 7 July: 13.0 µg/m³Washington, 8 July: 12.3 µg/m³LouisvilleLouisville, 1 July: 11.5 µg/m³Louisville, 2 July: 7.8 µg/m³Louisville, 3 July: 11.9 µg/m³Louisville, 4 July: 24.3 µg/m³Louisville, 5 July: 27.2 µg/m³, 3.0× its usual 9.0Louisville, 6 July: 9.4 µg/m³Louisville, 7 July: 11.1 µg/m³Louisville, 8 July: 10.6 µg/m³DublinDublin, 1 July: 9.0 µg/m³Dublin, 2 July: 6.0 µg/m³Dublin, 3 July: 5.3 µg/m³Dublin, 4 July: 13.7 µg/m³Dublin, 5 July: 26.6 µg/m³, 3.1× its usual 8.7Dublin, 6 July: 9.5 µg/m³Dublin, 7 July: 7.8 µg/m³Dublin, 8 July: 8.1 µg/m³AkronAkron, 1 July: 11.0 µg/m³Akron, 2 July: 5.1 µg/m³Akron, 3 July: 5.3 µg/m³Akron, 4 July: 22.6 µg/m³Akron, 5 July: 26.1 µg/m³, 3.3× its usual 8.0Akron, 6 July: 11.9 µg/m³Akron, 7 July: 7.4 µg/m³Akron, 8 July: 6.9 µg/m³WarrenWarren, 1 July: 13.8 µg/m³Warren, 2 July: 8.0 µg/m³Warren, 3 July: 6.1 µg/m³Warren, 4 July: 15.2 µg/m³Warren, 5 July: 26.0 µg/m³, 2.6× its usual 9.9Warren, 6 July: 13.0 µg/m³Warren, 7 July: 9.2 µg/m³Warren, 8 July: 10.1 µg/m³ClevelandCleveland, 1 July: 15.8 µg/m³Cleveland, 2 July: 7.9 µg/m³Cleveland, 3 July: 5.8 µg/m³Cleveland, 4 July: 18.4 µg/m³Cleveland, 5 July: 25.6 µg/m³, 2.4× its usual 10.5Cleveland, 6 July: 14.7 µg/m³Cleveland, 7 July: 5.7 µg/m³Cleveland, 8 July: 9.2 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
BayonneNew Jersey, United States1 56.95 July5.111×
New AlbanyIndiana, United States1 49.15 July7.66.5×
Jersey CityNew Jersey, United States1 44.25 July8.95.0×
ElizabethNew Jersey, United States1 49.05 July9.94.9×
Fort LeeNew Jersey, United States1 35.45 July7.74.6×
RedfordMichigan, United States1 45.65 July10.44.4×
LansingMichigan, United States2 37.85 July8.84.3×
PortageIndiana, United States1 39.04 July9.34.2×
FlintMichigan, United States2 33.14 July7.84.2×
GahannaOhio, United States1 30.74 July7.64.0×
East ChicagoIndiana, United States1 31.84 July8.13.9×
JeffersonvilleIndiana, United States2 31.85 July8.63.7×
NorwoodOhio, United States1 41.15 July11.33.6×
LindenNew Jersey, United States1 33.85 July9.33.6×
Grand RapidsMichigan, United States2 34.85 July9.93.5×
WilkinsburgPennsylvania, United States1 32.35 July9.33.5×
New York CityNew York, United States1 30.65 July8.73.5×
ClarksvilleTennessee, United States1 26.94 July7.73.5×
MasonOhio, United States1 28.95 July8.53.4×
IndianapolisIndiana, United States2 35.64 July10.83.3×
ChicagoIllinois, United States1 31.94 July9.63.3×
Des PlainesIllinois, United States1 28.74 July8.83.3×
AkronOhio, United States1 26.15 July8.03.3×
NorthbrookIllinois, United States1 28.95 July8.93.2×
HammondIndiana, United States1 30.44 July9.83.1×
DublinOhio, United States1 26.65 July8.73.1×
JeffersontownKentucky, United States1 26.04 July8.53.1×
Saint MatthewsKentucky, United States1 25.64 July8.33.1×
West MifflinPennsylvania, United States1 33.65 July11.13.0×
Terre HauteIndiana, United States1 31.34 July10.43.0×
GaryIndiana, United States1 29.04 July9.73.0×
WashingtonDistrict of Columbia, United States1 27.25 July9.13.0×
LouisvilleKentucky, United States1 27.25 July9.03.0×
MilwaukeeWisconsin, United States1 26.24 July8.83.0×
CantonOhio, United States1 30.15 July10.42.9×
ElkhartIndiana, United States1 28.64 July10.02.9×
CincinnatiOhio, United States1 31.35 July11.02.8×
SpringfieldOhio, United States1 29.15 July10.42.8×
South BendIndiana, United States1 26.34 July9.32.8×
Oak LawnIllinois, United States1 26.14 July9.42.8×
EvansvilleIndiana, United States1 25.34 July9.12.8×
East Saint LouisIllinois, United States1 26.14 July10.12.6×
WarrenOhio, United States1 26.05 July9.92.6×
MiddletownOhio, United States1 27.75 July11.62.4×
ClevelandOhio, United States1 25.65 July10.52.4×
Franklin ParkIllinois, United States1 25.34 July10.52.4×

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 23 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 2023: 46 cities with PM2.5 at twice their usual or more, 4 to 5 July 2023, smogrank.com/episodes/2023-07-04-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.