SmogRank / Episodes / United States

North-eastern United States, 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 OakChathamLincoln ParkDetroitTaylorDearbornYpsilantiLexington-FayetteErieSt. ThomasJohnstownPort HuronSarniaKingsportRoanokeLondonAndersonAltoonaBrantfordColumbusKitchenerFishersCharlottesvilleWinston-SalemHamiltonClemmonsKokomoValley StationState CollegeKalamazooElizabethtownHagerstownGreensboroSt. CatharinesBuffaloKenmoreBloomingtonCheektowagaLafayetteJenisonCarlisleDurhamRockvilleSpringfieldCookevilleHollandRose HillRichmondHarrisburgScaggsvilleSouth LaurelYorkHopewellHunt ValleyOwensboroBaltimoreRoanoke RapidsRochesterLebanonHendersonvilleLancasterCalumet CityEdgewoodReadingElktonJolietNewarkEast HamptonZionBearNapervilleChesapeakeWilmingtonDoverSouth MilwaukeeScrantonAllentownCaryChesterNorristownBethlehemSyracuseDecaturPhiladelphiaWaukeshaBloomingtonPennsaukenSouth VinelandPaducahBensalemEwingTrentonRockfordPleasantvilleSpringfieldUticaNew BrunswickToms RiverPatersonMadisonGranite CityNew CitySt. LouisDyersburgNewburghLemayUniversity CityClintonWhite PlainsArnoldHempsteadMolineDavenportDanburyAlbanyBridgeportHolbrookMuscatineWaterburyPittsfieldNew HavenHartfordClevelandMiddletownFranklin ParkWarrenEast Saint LouisSpringfieldCincinnatiSouth BendOak LawnEvansvilleCantonElkhartWest MifflinLouisvilleWashingtonMilwaukeeGaryTerre HauteDublinHammondSaint MatthewsJeffersontownNorthbrookAkronDes PlainesChicagoIndianapolisMasonWilkinsburgNew York CityGrand RapidsClarksvilleLindenNorwoodJeffersonvilleEast 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

New York CityNew York City, 1 July: 33.5 µg/m³, 3.9× usualNew York City, 2 July: 21.7 µg/m³, 2.5× usualNew York City, 3 July: 8.0 µg/m³, 0.9× usualNew York City, 4 July: 21.0 µg/m³, 2.4× usualNew York City, 5 July: 30.6 µg/m³, 3.5× usualNew York City, 6 July: 10.3 µg/m³, 1.2× usualNew York City, 7 July: 9.3 µg/m³, 1.1× usualNew York City, 8 July: 9.8 µg/m³, 1.1× usualElizabethElizabeth, 1 July: 32.0 µg/m³, 3.2× usualElizabeth, 2 July: 21.5 µg/m³, 2.2× usualElizabeth, 3 July: 10.8 µg/m³, 1.1× usualElizabeth, 4 July: 12.4 µg/m³, 1.3× usualElizabeth, 5 July: 49.0 µg/m³, 4.9× usualElizabeth, 6 July: 16.6 µg/m³, 1.7× usualElizabeth, 7 July: 14.9 µg/m³, 1.5× usualElizabeth, 8 July: 14.4 µg/m³, 1.5× usualFort LeeFort Lee, 1 July: 29.9 µg/m³, 3.9× usualFort Lee, 2 July: 17.3 µg/m³, 2.2× usualFort Lee, 3 July: 7.4 µg/m³, 1.0× usualFort Lee, 4 July: 21.9 µg/m³, 2.8× usualFort Lee, 5 July: 35.4 µg/m³, 4.6× usualFort Lee, 6 July: 8.3 µg/m³, 1.1× usualFort Lee, 7 July: 5.4 µg/m³, 0.7× usualFort Lee, 8 July: 7.0 µg/m³, 0.9× usualWashingtonWashington, 1 July: 29.8 µg/m³, 3.3× usualWashington, 2 July: 13.3 µg/m³, 1.5× usualWashington, 3 July: 10.5 µg/m³, 1.2× usualWashington, 4 July: 28.1 µg/m³, 3.1× usualWashington, 5 July: 27.2 µg/m³, 3.0× usualWashington, 6 July: 14.1 µg/m³, 1.5× usualWashington, 7 July: 13.0 µg/m³, 1.4× usualWashington, 8 July: 12.3 µg/m³, 1.4× usualJersey CityJersey City, 1 July: 29.4 µg/m³, 3.3× usualJersey City, 2 July: 19.7 µg/m³, 2.2× usualJersey City, 3 July: 8.8 µg/m³, 1.0× usualJersey City, 4 July: 13.6 µg/m³, 1.5× usualJersey City, 5 July: 44.2 µg/m³, 5.0× usualJersey City, 6 July: 12.3 µg/m³, 1.4× usualJersey City, 7 July: 10.8 µg/m³, 1.2× usualJersey City, 8 July: 11.9 µg/m³, 1.3× usualLindenLinden, 1 July: 29.2 µg/m³, 3.1× usualLinden, 2 July: 19.6 µg/m³, 2.1× usualLinden, 3 July: 7.6 µg/m³, 0.8× usualLinden, 4 July: 23.6 µg/m³, 2.5× usualLinden, 5 July: 33.8 µg/m³, 3.6× usualLinden, 6 July: 11.6 µg/m³, 1.2× usualLinden, 7 July: 11.0 µg/m³, 1.2× usualLinden, 8 July: 11.8 µg/m³, 1.3× usualBayonneBayonne, 1 July: 19.2 µg/m³, 3.8× usualBayonne, 2 July: 14.2 µg/m³, 2.8× usualBayonne, 3 July: 5.5 µg/m³, 1.1× usualBayonne, 4 July: 74.3 µg/m³, 15× usualBayonne, 5 July: 56.9 µg/m³, 11× usualBayonne, 6 July: 5.7 µg/m³, 1.1× usualBayonne, 7 July: 4.9 µg/m³, 1.0× usualBayonne, 8 July: 5.7 µg/m³, 1.1× usualPortagePortage, 1 July: 23.3 µg/m³, 2.5× usualPortage, 2 July: 8.7 µg/m³, 0.9× usualPortage, 3 July: 10.7 µg/m³, 1.2× usualPortage, 4 July: 39.0 µg/m³, 4.2× usualPortage, 5 July: 16.4 µg/m³, 1.8× usualPortage, 6 July: 11.8 µg/m³, 1.3× usualPortage, 7 July: 8.3 µg/m³, 0.9× usualPortage, 8 July: 6.9 µg/m³, 0.7× usualIndianapolisIndianapolis, 1 July: 7.3 µg/m³, 0.7× usualIndianapolis, 2 July: 6.3 µg/m³, 0.6× usualIndianapolis, 3 July: 11.2 µg/m³, 1.0× usualIndianapolis, 4 July: 35.6 µg/m³, 3.3× usualIndianapolis, 5 July: 33.7 µg/m³, 3.1× usualIndianapolis, 6 July: 7.4 µg/m³, 0.7× usualIndianapolis, 7 July: 11.5 µg/m³, 1.1× usualIndianapolis, 8 July: 6.5 µg/m³, 0.6× usualGrand RapidsGrand Rapids, 1 July: 23.9 µg/m³, 2.4× usualGrand Rapids, 2 July: 14.2 µg/m³, 1.4× usualGrand Rapids, 3 July: 15.2 µg/m³, 1.5× usualGrand Rapids, 4 July: 34.6 µg/m³, 3.5× usualGrand Rapids, 5 July: 34.8 µg/m³, 3.5× usualGrand Rapids, 6 July: 10.4 µg/m³, 1.1× usualGrand Rapids, 7 July: 9.8 µg/m³, 1.0× usualGrand Rapids, 8 July: 7.9 µg/m³, 0.8× usualLansingLansing, 1 July: 19.2 µg/m³, 2.2× usualLansing, 2 July: 10.3 µg/m³, 1.2× usualLansing, 3 July: 9.1 µg/m³, 1.0× usualLansing, 4 July: 33.7 µg/m³, 3.8× usualLansing, 5 July: 37.8 µg/m³, 4.3× usualLansing, 6 July: 7.4 µg/m³, 0.8× usualLansing, 7 July: 8.2 µg/m³, 0.9× usualLansing, 8 July: 8.0 µg/m³, 0.9× usualFlintFlint, 1 July: 11.6 µg/m³, 1.5× usualFlint, 2 July: 6.7 µg/m³, 0.9× usualFlint, 3 July: 2.8 µg/m³, 0.4× usualFlint, 4 July: 33.1 µg/m³, 4.2× usualFlint, 5 July: 25.6 µg/m³, 3.3× usualFlint, 6 July: 3.1 µg/m³, 0.4× usualFlint, 7 July: 3.2 µg/m³, 0.4× usualFlint, 8 July: 3.4 µg/m³, 0.4× usualChicagoChicago, 1 July: 20.7 µg/m³, 2.2× usualChicago, 2 July: 12.9 µg/m³, 1.3× usualChicago, 3 July: 12.6 µg/m³, 1.3× usualChicago, 4 July: 31.9 µg/m³, 3.3× usualChicago, 5 July: 19.5 µg/m³, 2.0× usualChicago, 6 July: 9.3 µg/m³, 1.0× usualChicago, 7 July: 10.1 µg/m³, 1.1× usualChicago, 8 July: 8.4 µg/m³, 0.9× usualEast ChicagoEast Chicago, 1 July: 19.3 µg/m³, 2.4× usualEast Chicago, 2 July: 5.6 µg/m³, 0.7× usualEast Chicago, 3 July: 11.4 µg/m³, 1.4× usualEast Chicago, 4 July: 31.8 µg/m³, 3.9× usualEast Chicago, 5 July: 12.2 µg/m³, 1.5× usualEast Chicago, 6 July: 9.5 µg/m³, 1.2× usualEast Chicago, 7 July: 8.1 µg/m³, 1.0× usualEast Chicago, 8 July: 6.9 µg/m³, 0.9× usualTerre HauteTerre Haute, 1 July: no readingTerre Haute, 2 July: no readingTerre Haute, 3 July: 12.5 µg/m³, 1.2× usualTerre Haute, 4 July: 31.3 µg/m³, 3.0× usualTerre Haute, 5 July: 21.6 µg/m³, 2.1× usualTerre Haute, 6 July: 7.6 µg/m³, 0.7× usualTerre Haute, 7 July: 6.7 µg/m³, 0.6× usualTerre Haute, 8 July: 5.3 µg/m³, 0.5× usualGahannaGahanna, 1 July: 6.8 µg/m³, 0.9× usualGahanna, 2 July: 4.2 µg/m³, 0.6× usualGahanna, 3 July: 4.5 µg/m³, 0.6× usualGahanna, 4 July: 30.7 µg/m³, 4.0× usualGahanna, 5 July: 17.0 µg/m³, 2.2× usualGahanna, 6 July: 7.0 µg/m³, 0.9× usualGahanna, 7 July: 5.3 µg/m³, 0.7× usualGahanna, 8 July: 5.8 µg/m³, 0.8× usualHammondHammond, 1 July: 20.0 µg/m³, 2.0× usualHammond, 2 July: 5.5 µg/m³, 0.6× usualHammond, 3 July: 14.3 µg/m³, 1.5× usualHammond, 4 July: 30.4 µg/m³, 3.1× usualHammond, 5 July: 11.0 µg/m³, 1.1× usualHammond, 6 July: 10.3 µg/m³, 1.1× usualHammond, 7 July: 11.5 µg/m³, 1.2× usualHammond, 8 July: 7.1 µg/m³, 0.7× usualGaryGary, 1 July: 21.4 µg/m³, 2.2× usualGary, 2 July: 8.6 µg/m³, 0.9× usualGary, 3 July: 9.8 µg/m³, 1.0× usualGary, 4 July: 29.0 µg/m³, 3.0× usualGary, 5 July: 19.1 µg/m³, 2.0× usualGary, 6 July: 12.1 µg/m³, 1.2× usualGary, 7 July: 7.9 µg/m³, 0.8× usualGary, 8 July: 8.7 µg/m³, 0.9× usualDes PlainesDes Plaines, 1 July: 21.0 µg/m³, 2.4× usualDes Plaines, 2 July: 13.8 µg/m³, 1.6× usualDes Plaines, 3 July: 13.7 µg/m³, 1.6× usualDes Plaines, 4 July: 28.7 µg/m³, 3.3× usualDes Plaines, 5 July: 23.3 µg/m³, 2.6× usualDes Plaines, 6 July: 9.6 µg/m³, 1.1× usualDes Plaines, 7 July: 10.0 µg/m³, 1.1× usualDes Plaines, 8 July: 7.5 µg/m³, 0.9× usualElkhartElkhart, 1 July: 8.9 µg/m³, 0.9× usualElkhart, 2 July: 4.0 µg/m³, 0.4× usualElkhart, 3 July: 10.9 µg/m³, 1.1× usualElkhart, 4 July: 28.6 µg/m³, 2.9× usualElkhart, 5 July: 15.2 µg/m³, 1.5× usualElkhart, 6 July: 7.2 µg/m³, 0.7× usualElkhart, 7 July: 8.4 µg/m³, 0.8× usualElkhart, 8 July: 9.1 µg/m³, 0.9× usualClarksvilleClarksville, 1 July: 8.6 µg/m³, 1.1× usualClarksville, 2 July: 8.9 µg/m³, 1.2× usualClarksville, 3 July: 8.9 µg/m³, 1.2× usualClarksville, 4 July: 26.9 µg/m³, 3.5× usualClarksville, 5 July: 7.8 µg/m³, 1.0× usualClarksville, 6 July: 6.5 µg/m³, 0.8× usualClarksville, 7 July: 8.5 µg/m³, 1.1× usualClarksville, 8 July: 7.8 µg/m³, 1.0× usualSouth BendSouth Bend, 1 July: 12.6 µg/m³, 1.4× usualSouth Bend, 2 July: 5.0 µg/m³, 0.5× usualSouth Bend, 3 July: 11.1 µg/m³, 1.2× usualSouth Bend, 4 July: 26.3 µg/m³, 2.8× usualSouth Bend, 5 July: 18.1 µg/m³, 1.9× usualSouth Bend, 6 July: 9.0 µg/m³, 1.0× usualSouth Bend, 7 July: 9.8 µg/m³, 1.1× usualSouth Bend, 8 July: 7.6 µg/m³, 0.8× usualMilwaukeeMilwaukee, 1 July: 19.9 µg/m³, 2.3× usualMilwaukee, 2 July: 15.4 µg/m³, 1.8× usualMilwaukee, 3 July: 13.9 µg/m³, 1.6× usualMilwaukee, 4 July: 26.2 µg/m³, 3.0× usualMilwaukee, 5 July: 15.6 µg/m³, 1.8× usualMilwaukee, 6 July: 11.9 µg/m³, 1.4× usualMilwaukee, 7 July: 9.0 µg/m³, 1.0× usualMilwaukee, 8 July: 8.2 µg/m³, 0.9× usualOak LawnOak Lawn, 1 July: 16.3 µg/m³, 1.7× usualOak Lawn, 2 July: 7.8 µg/m³, 0.8× usualOak Lawn, 3 July: 11.7 µg/m³, 1.2× usualOak Lawn, 4 July: 26.1 µg/m³, 2.8× usualOak Lawn, 5 July: 17.0 µg/m³, 1.8× usualOak Lawn, 6 July: 10.3 µg/m³, 1.1× usualOak Lawn, 7 July: 11.4 µg/m³, 1.2× usualOak Lawn, 8 July: 7.6 µg/m³, 0.8× usualEast 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× usualEast Saint Louis, 5 July: 11.3 µg/m³, 1.1× usualEast Saint Louis, 6 July: 9.2 µg/m³, 0.9× usualEast Saint Louis, 7 July: 7.8 µg/m³, 0.8× usualEast Saint Louis, 8 July: 7.1 µg/m³, 0.7× usualJeffersontownJeffersontown, 1 July: 9.7 µg/m³, 1.1× usualJeffersontown, 2 July: 6.2 µg/m³, 0.7× usualJeffersontown, 3 July: 11.8 µg/m³, 1.4× usualJeffersontown, 4 July: 26.0 µg/m³, 3.1× usualJeffersontown, 5 July: 17.0 µg/m³, 2.0× usualJeffersontown, 6 July: 8.4 µg/m³, 1.0× usualJeffersontown, 7 July: 9.7 µg/m³, 1.1× usualJeffersontown, 8 July: 9.2 µg/m³, 1.1× usualSaint MatthewsSaint Matthews, 1 July: no readingSaint Matthews, 2 July: no readingSaint Matthews, 3 July: 10.7 µg/m³, 1.3× usualSaint Matthews, 4 July: 25.6 µg/m³, 3.1× usualSaint Matthews, 5 July: 22.4 µg/m³, 2.7× usualSaint Matthews, 6 July: 8.2 µg/m³, 1.0× usualSaint Matthews, 7 July: 9.3 µg/m³, 1.1× usualSaint Matthews, 8 July: 9.5 µg/m³, 1.1× usualJeffersonvilleJeffersonville, 1 July: 10.1 µg/m³, 1.2× usualJeffersonville, 2 July: 6.5 µg/m³, 0.8× usualJeffersonville, 3 July: 11.2 µg/m³, 1.3× usualJeffersonville, 4 July: 25.3 µg/m³, 2.9× usualJeffersonville, 5 July: 31.8 µg/m³, 3.7× usualJeffersonville, 6 July: 9.3 µg/m³, 1.1× usualJeffersonville, 7 July: 10.4 µg/m³, 1.2× usualJeffersonville, 8 July: 11.0 µg/m³, 1.3× usualEvansvilleEvansville, 1 July: 8.4 µg/m³, 0.9× usualEvansville, 2 July: 6.0 µg/m³, 0.7× usualEvansville, 3 July: 11.9 µg/m³, 1.3× usualEvansville, 4 July: 25.3 µg/m³, 2.8× usualEvansville, 5 July: 19.1 µg/m³, 2.1× usualEvansville, 6 July: 7.1 µg/m³, 0.8× usualEvansville, 7 July: 9.9 µg/m³, 1.1× usualEvansville, 8 July: 8.8 µg/m³, 1.0× usualFranklin ParkFranklin Park, 1 July: 19.1 µg/m³, 1.8× usualFranklin Park, 2 July: 11.4 µg/m³, 1.1× usualFranklin Park, 3 July: 11.8 µg/m³, 1.1× usualFranklin Park, 4 July: 25.3 µg/m³, 2.4× usualFranklin Park, 5 July: 16.3 µg/m³, 1.6× usualFranklin Park, 6 July: 9.0 µg/m³, 0.9× usualFranklin Park, 7 July: 9.2 µg/m³, 0.9× usualFranklin Park, 8 July: 6.6 µg/m³, 0.6× usualNew AlbanyNew Albany, 1 July: 10.9 µg/m³, 1.4× usualNew Albany, 2 July: no readingNew Albany, 3 July: no readingNew Albany, 4 July: 19.4 µg/m³, 2.6× usualNew Albany, 5 July: 49.1 µg/m³, 6.5× usualNew Albany, 6 July: no readingNew Albany, 7 July: no readingNew Albany, 8 July: 7.1 µg/m³, 0.9× usualRedfordRedford, 1 July: 21.1 µg/m³, 2.0× usualRedford, 2 July: 7.5 µg/m³, 0.7× usualRedford, 3 July: 6.3 µg/m³, 0.6× usualRedford, 4 July: 22.5 µg/m³, 2.2× usualRedford, 5 July: 45.6 µg/m³, 4.4× usualRedford, 6 July: 11.1 µg/m³, 1.1× usualRedford, 7 July: 8.3 µg/m³, 0.8× usualRedford, 8 July: 8.3 µg/m³, 0.8× usualNorwoodNorwood, 1 July: 9.7 µg/m³, 0.9× usualNorwood, 2 July: 6.2 µg/m³, 0.5× usualNorwood, 3 July: 6.4 µg/m³, 0.6× usualNorwood, 4 July: 21.3 µg/m³, 1.9× usualNorwood, 5 July: 41.1 µg/m³, 3.6× usualNorwood, 6 July: 12.5 µg/m³, 1.1× usualNorwood, 7 July: 10.1 µg/m³, 0.9× usualNorwood, 8 July: 9.3 µg/m³, 0.8× usualWest MifflinWest Mifflin, 1 July: 19.0 µg/m³, 1.7× usualWest Mifflin, 2 July: 11.3 µg/m³, 1.0× usualWest Mifflin, 3 July: 12.0 µg/m³, 1.1× usualWest Mifflin, 4 July: 14.2 µg/m³, 1.3× usualWest Mifflin, 5 July: 33.6 µg/m³, 3.0× usualWest Mifflin, 6 July: 20.1 µg/m³, 1.8× usualWest Mifflin, 7 July: 13.7 µg/m³, 1.2× usualWest Mifflin, 8 July: 11.6 µg/m³, 1.0× usualWilkinsburgWilkinsburg, 1 July: 13.6 µg/m³, 1.5× usualWilkinsburg, 2 July: 10.1 µg/m³, 1.1× usualWilkinsburg, 3 July: 6.6 µg/m³, 0.7× usualWilkinsburg, 4 July: 17.2 µg/m³, 1.8× usualWilkinsburg, 5 July: 32.3 µg/m³, 3.5× usualWilkinsburg, 6 July: 13.6 µg/m³, 1.5× usualWilkinsburg, 7 July: 11.7 µg/m³, 1.3× usualWilkinsburg, 8 July: 10.5 µg/m³, 1.1× usualCincinnatiCincinnati, 1 July: 9.2 µg/m³, 0.8× usualCincinnati, 2 July: 5.7 µg/m³, 0.5× usualCincinnati, 3 July: 5.8 µg/m³, 0.5× usualCincinnati, 4 July: 23.4 µg/m³, 2.1× usualCincinnati, 5 July: 31.3 µg/m³, 2.8× usualCincinnati, 6 July: 10.9 µg/m³, 1.0× usualCincinnati, 7 July: 9.7 µg/m³, 0.9× usualCincinnati, 8 July: 8.7 µg/m³, 0.8× usualCantonCanton, 1 July: 13.3 µg/m³, 1.3× usualCanton, 2 July: 5.9 µg/m³, 0.6× usualCanton, 3 July: 7.1 µg/m³, 0.7× usualCanton, 4 July: 22.2 µg/m³, 2.1× usualCanton, 5 July: 30.1 µg/m³, 2.9× usualCanton, 6 July: 15.9 µg/m³, 1.5× usualCanton, 7 July: 10.1 µg/m³, 1.0× usualCanton, 8 July: 10.5 µg/m³, 1.0× usualSpringfieldSpringfield, 1 July: 9.7 µg/m³, 0.9× usualSpringfield, 2 July: 6.0 µg/m³, 0.6× usualSpringfield, 3 July: 5.7 µg/m³, 0.5× usualSpringfield, 4 July: 18.6 µg/m³, 1.8× usualSpringfield, 5 July: 29.1 µg/m³, 2.8× usualSpringfield, 6 July: 10.3 µg/m³, 1.0× usualSpringfield, 7 July: 8.9 µg/m³, 0.9× usualSpringfield, 8 July: 8.6 µg/m³, 0.8× usualMasonMason, 1 July: 8.4 µg/m³, 1.0× usualMason, 2 July: 5.3 µg/m³, 0.6× usualMason, 3 July: 5.3 µg/m³, 0.6× usualMason, 4 July: 18.1 µg/m³, 2.1× usualMason, 5 July: 28.9 µg/m³, 3.4× usualMason, 6 July: 12.2 µg/m³, 1.4× usualMason, 7 July: 8.4 µg/m³, 1.0× usualMason, 8 July: 8.3 µg/m³, 1.0× usualNorthbrookNorthbrook, 1 July: 23.9 µg/m³, 2.7× usualNorthbrook, 2 July: 18.9 µg/m³, 2.1× usualNorthbrook, 3 July: 11.5 µg/m³, 1.3× usualNorthbrook, 4 July: 23.6 µg/m³, 2.7× usualNorthbrook, 5 July: 28.9 µg/m³, 3.2× usualNorthbrook, 6 July: 10.4 µg/m³, 1.2× usualNorthbrook, 7 July: 9.6 µg/m³, 1.1× usualNorthbrook, 8 July: 7.4 µg/m³, 0.8× usualMiddletownMiddletown, 1 July: 9.8 µg/m³, 0.8× usualMiddletown, 2 July: 6.3 µg/m³, 0.5× usualMiddletown, 3 July: 7.2 µg/m³, 0.6× usualMiddletown, 4 July: 15.6 µg/m³, 1.3× usualMiddletown, 5 July: 27.7 µg/m³, 2.4× usualMiddletown, 6 July: 12.7 µg/m³, 1.1× usualMiddletown, 7 July: 11.0 µg/m³, 0.9× usualMiddletown, 8 July: 9.7 µg/m³, 0.8× usualLouisvilleLouisville, 1 July: 11.5 µg/m³, 1.3× usualLouisville, 2 July: 7.8 µg/m³, 0.9× usualLouisville, 3 July: 11.9 µg/m³, 1.3× usualLouisville, 4 July: 24.3 µg/m³, 2.7× usualLouisville, 5 July: 27.2 µg/m³, 3.0× usualLouisville, 6 July: 9.4 µg/m³, 1.0× usualLouisville, 7 July: 11.1 µg/m³, 1.2× usualLouisville, 8 July: 10.6 µg/m³, 1.2× usualDublinDublin, 1 July: 9.0 µg/m³, 1.0× usualDublin, 2 July: 6.0 µg/m³, 0.7× usualDublin, 3 July: 5.3 µg/m³, 0.6× usualDublin, 4 July: 13.7 µg/m³, 1.6× usualDublin, 5 July: 26.6 µg/m³, 3.1× usualDublin, 6 July: 9.5 µg/m³, 1.1× usualDublin, 7 July: 7.8 µg/m³, 0.9× usualDublin, 8 July: 8.1 µg/m³, 0.9× usualAkronAkron, 1 July: 11.0 µg/m³, 1.4× usualAkron, 2 July: 5.1 µg/m³, 0.6× usualAkron, 3 July: 5.3 µg/m³, 0.7× usualAkron, 4 July: 22.6 µg/m³, 2.8× usualAkron, 5 July: 26.1 µg/m³, 3.3× usualAkron, 6 July: 11.9 µg/m³, 1.5× usualAkron, 7 July: 7.4 µg/m³, 0.9× usualAkron, 8 July: 6.9 µg/m³, 0.9× usualWarrenWarren, 1 July: 13.8 µg/m³, 1.4× usualWarren, 2 July: 8.0 µg/m³, 0.8× usualWarren, 3 July: 6.1 µg/m³, 0.6× usualWarren, 4 July: 15.2 µg/m³, 1.5× usualWarren, 5 July: 26.0 µg/m³, 2.6× usualWarren, 6 July: 13.0 µg/m³, 1.3× usualWarren, 7 July: 9.2 µg/m³, 0.9× usualWarren, 8 July: 10.1 µg/m³, 1.0× usualClevelandCleveland, 1 July: 15.8 µg/m³, 1.5× usualCleveland, 2 July: 7.9 µg/m³, 0.8× usualCleveland, 3 July: 5.8 µg/m³, 0.6× usualCleveland, 4 July: 18.4 µg/m³, 1.8× usualCleveland, 5 July: 25.6 µg/m³, 2.4× usualCleveland, 6 July: 14.7 µg/m³, 1.4× usualCleveland, 7 July: 5.7 µg/m³, 0.5× usualCleveland, 8 July: 9.2 µg/m³, 0.9× usual1 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 74.34 July5.115×
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×
FlintMichigan, United States2 33.14 July7.84.2×
PortageIndiana, United States1 39.04 July9.34.2×
GahannaOhio, United States1 30.74 July7.64.0×
East ChicagoIndiana, United States1 31.84 July8.13.9×
New York CityNew York, United States1 33.51 July8.73.9×
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×
ClarksvilleTennessee, United States1 26.94 July7.73.5×
WilkinsburgPennsylvania, United States1 32.35 July9.33.5×
MasonOhio, United States1 28.95 July8.53.4×
ChicagoIllinois, United States1 31.94 July9.63.3×
IndianapolisIndiana, United States2 35.64 July10.83.3×
WashingtonDistrict of Columbia, United States1 29.81 July9.13.3×
AkronOhio, United States1 26.15 July8.03.3×
Des PlainesIllinois, United States1 28.74 July8.83.3×
NorthbrookIllinois, United States1 28.95 July8.93.2×
HammondIndiana, United States1 30.44 July9.83.1×
Saint MatthewsKentucky, United States1 25.64 July8.33.1×
JeffersontownKentucky, United States1 26.04 July8.53.1×
DublinOhio, United States1 26.65 July8.73.1×
West MifflinPennsylvania, United States1 33.65 July11.13.0×
LouisvilleKentucky, United States1 27.25 July9.03.0×
Terre HauteIndiana, United States1 31.34 July10.43.0×
GaryIndiana, United States1 29.04 July9.73.0×
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×
South BendIndiana, United States1 26.34 July9.32.8×
SpringfieldOhio, United States1 29.15 July10.42.8×
EvansvilleIndiana, United States1 25.34 July9.12.8×
Oak LawnIllinois, United States1 26.14 July9.42.8×
WarrenOhio, United States1 26.05 July9.92.6×
East Saint LouisIllinois, United States1 26.14 July10.12.6×
ClevelandOhio, United States1 25.65 July10.52.4×
Franklin ParkIllinois, United States1 25.34 July10.52.4×
MiddletownOhio, United States1 27.75 July11.62.4×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in the United States

Number 9 of 41 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 41.

Use this page

SmogRank, North-eastern United States, July 2023: 46 cities with PM2.5 at twice their usual or more, 4 to 5 July 2023, smogrank.com/episodes/2023-07-north-eastern-united-states (accessed 2 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.