SmogRank / Episodes / United States

Ohio and New York, United States, August 2023

For 1 day, on 3 August 2023, 8 cities in the United States had PM2.5 at least twice their usual for the time of year. The worst reading was Warren, Ohio, United States: 30.1 µg/m³ on 3 August, about 2.8× its usual 10.9.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 1 country
Days13 August 2023
Worst day3 August8 cities counted
Furthest above usual3.6×Erie

Day by day

3 August 8 cities at twice their usual or more
HermitagePainesvilleBrantfordSt. ThomasHamiltonPittsburghWilkinsburgWaterdownLondonWeirton HeightsAkronWest MifflinSteubenvilleKitchenerMcKeesportSt. CatharinesOakvilleGuelphMiltonBuffaloMississaugaMedinaBramptonWheelingTorontoJohnstownChathamAltoonaNewmarketBrooklinSarniaPort HuronState CollegeWindsorDetroitRochesterLincoln ParkDearbornTaylorPeterboroughRedfordWestervilleGahannaToledoHagerstownDublinYpsilantiCarlisleFlintBellevilleHarrisburgYorkLimaBay CitySpringfieldLebanonSyracuseHunt ValleyLancasterLansingKingstonDaytonReadingScrantonLebanonMiddletownAllentownElktonNewarkBethlehemBearUticaWilmingtonNorristownChesterKalamazooPhiladelphiaPennsaukenGrand RapidsBensalemEwingAndersonSouth VinelandCantonClevelandYoungstownWarrenShaker HeightsCheektowagaKenmoreErie
31 Jul1 Aug23456
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

CantonCanton, 31 July: 8.5 µg/m³, 0.8× usualCanton, 1 August: 22.9 µg/m³, 2.0× usualCanton, 2 August: 25.7 µg/m³, 2.3× usualCanton, 3 August: 26.9 µg/m³, 2.4× usualCanton, 4 August: 25.7 µg/m³, 2.3× usualCanton, 5 August: 22.9 µg/m³, 2.0× usualCanton, 6 August: 14.8 µg/m³, 1.3× usualWarrenWarren, 31 July: 10.7 µg/m³, 1.0× usualWarren, 1 August: 15.3 µg/m³, 1.4× usualWarren, 2 August: 21.8 µg/m³, 2.0× usualWarren, 3 August: 30.1 µg/m³, 2.8× usualWarren, 4 August: 26.3 µg/m³, 2.4× usualWarren, 5 August: 23.3 µg/m³, 2.1× usualWarren, 6 August: 15.6 µg/m³, 1.4× usualClevelandCleveland, 31 July: 10.0 µg/m³, 0.9× usualCleveland, 1 August: 15.6 µg/m³, 1.4× usualCleveland, 2 August: 16.2 µg/m³, 1.5× usualCleveland, 3 August: 29.7 µg/m³, 2.7× usualCleveland, 4 August: 24.3 µg/m³, 2.2× usualCleveland, 5 August: 21.5 µg/m³, 2.0× usualCleveland, 6 August: 16.6 µg/m³, 1.5× usualErieErie, 31 July: 6.3 µg/m³, 0.8× usualErie, 1 August: 6.1 µg/m³, 0.8× usualErie, 2 August: 11.1 µg/m³, 1.5× usualErie, 3 August: 27.3 µg/m³, 3.6× usualErie, 4 August: 22.1 µg/m³, 2.9× usualErie, 5 August: 20.0 µg/m³, 2.6× usualErie, 6 August: 15.1 µg/m³, 2.0× usualCheektowagaCheektowaga, 31 July: 7.5 µg/m³, 0.9× usualCheektowaga, 1 August: 6.4 µg/m³, 0.7× usualCheektowaga, 2 August: 7.0 µg/m³, 0.8× usualCheektowaga, 3 August: 26.8 µg/m³, 3.1× usualCheektowaga, 4 August: 24.4 µg/m³, 2.8× usualCheektowaga, 5 August: 16.8 µg/m³, 2.0× usualCheektowaga, 6 August: 12.5 µg/m³, 1.5× usualYoungstownYoungstown, 31 July: 8.7 µg/m³, 0.9× usualYoungstown, 1 August: 13.8 µg/m³, 1.5× usualYoungstown, 2 August: 21.7 µg/m³, 2.3× usualYoungstown, 3 August: 26.3 µg/m³, 2.8× usualYoungstown, 4 August: 24.4 µg/m³, 2.6× usualYoungstown, 5 August: 23.7 µg/m³, 2.5× usualYoungstown, 6 August: 15.3 µg/m³, 1.6× usualKenmoreKenmore, 31 July: 1.6 µg/m³, 0.2× usualKenmore, 1 August: 2.0 µg/m³, 0.3× usualKenmore, 2 August: 7.2 µg/m³, 0.9× usualKenmore, 3 August: 25.9 µg/m³, 3.2× usualKenmore, 4 August: 21.3 µg/m³, 2.7× usualKenmore, 5 August: 15.8 µg/m³, 2.0× usualKenmore, 6 August: 13.1 µg/m³, 1.6× usualShaker HeightsShaker Heights, 31 July: 7.8 µg/m³, 0.9× usualShaker Heights, 1 August: 11.5 µg/m³, 1.4× usualShaker Heights, 2 August: 12.6 µg/m³, 1.5× usualShaker Heights, 3 August: 25.3 µg/m³, 3.0× usualShaker Heights, 4 August: 23.1 µg/m³, 2.8× usualShaker Heights, 5 August: 19.1 µg/m³, 2.3× usualShaker Heights, 6 August: 13.2 µg/m³, 1.6× usual31 Jul1 Aug23456
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
EriePennsylvania, United States1 27.33 August7.63.6×
KenmoreNew York, United States1 25.93 August8.03.2×
CheektowagaNew York, United States1 26.83 August8.63.1×
Shaker HeightsOhio, United States1 25.33 August8.33.0×
YoungstownOhio, United States1 26.33 August9.42.8×
WarrenOhio, United States1 30.13 August10.92.8×
ClevelandOhio, United States1 29.73 August10.92.7×
CantonOhio, United States1 26.93 August11.32.4×

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 39 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, Ohio and New York, United States, August 2023: 8 cities with PM2.5 at twice their usual or more, 3 August 2023, smogrank.com/episodes/2023-08-ohio-and-new-york-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.