Air quality in Ontario
Air quality index (AQI⁺) and PM2.5 air pollution in Ontario • 12:18, Oct 09
Government of Ontario, Ministry of the EnvironmentOklahoma Department of Environmental Quality AnonymousJim GuilletPiéEVCO**Chris Fournier@airqualitybrampton & airqualitybrampton@gmail.comHamilton Air Monitoring Network - HAMNGraydonMark OberemkSouth RichvaleMC2025Stacey SchacterstevepaulquinnBelltown - Oakley AveMeAmy CuriousKevin DamenNichols FamilyAnonymousElectric Vehicle Council of OttawaCSA HamiltonianMikoAirJayDeeVBbsummAnonymous DGEC - GreensvilleSlyyyMinistry of the Environment and the Fight against Climate ChangePaulAnonymousSteven RichierandalljhowardARTJackBMatt WojtowiczDataforge CanadaMichiruBradley SangerSWWildflower Bee Farm Ontario and Nova ScotiaBijanTimothy DresserBBT Batteries Ltd.Eric SteinCaptain Benjamin WillardAnonymousHaig BlvdDave McKeeCanadian Air and Precipitation Monitoring NetworkPierreKatwyks on the RiverMeJpSS WepplerAnonymousPeter CornelisseMitch LGregMattAnonymous contributor
1 stations sponsored by The Foundation for Clean Air
Government of Ontario, Ministry of the EnvironmentOklahoma Department of Environmental Quality AnonymousJim GuilletPiéEVCO**Chris Fournier@airqualitybrampton & airqualitybrampton@gmail.comHamilton Air Monitoring Network - HAMNGraydonMark OberemkSouth RichvaleMC2025Stacey SchacterstevepaulquinnBelltown - Oakley AveMeAmy CuriousKevin DamenNichols FamilyAnonymousElectric Vehicle Council of OttawaCSA HamiltonianMikoAirJayDeeVBbsummAnonymous DGEC - GreensvilleSlyyyMinistry of the Environment and the Fight against Climate ChangePaulAnonymousSteven RichierandalljhowardARTJackBMatt WojtowiczDataforge CanadaMichiruBradley SangerSWWildflower Bee Farm Ontario and Nova ScotiaBijanTimothy DresserBBT Batteries Ltd.Eric SteinCaptain Benjamin WillardAnonymousHaig BlvdDave McKeeCanadian Air and Precipitation Monitoring NetworkPierreKatwyks on the RiverMeJpSS WepplerAnonymousPeter CornelisseMitch LGregMattAnonymous contributor
1 stations sponsored by The Foundation for Clean Air
Live most polluted city ranking
Real-time Ontario most polluted city ranking
Wildfires in Ontario
Real-time information
Active fires
--
Learn more about global air quality
Which is the most polluted city in Ontario?
- St. Catharines71
- Oakville50
- Bruce Mines49
- Milton33
- East York32
- Guelph32
- Grand Bend30
- Hamilton29
- Niagara on the Lake29
- Brantford28
- Burlington28
- Tiverton28
- Toronto28
- Wellington County28
- Vaughan27
- Dorchester26
- Hawkesbury26
- Hawkesville26
- Kitchener26
- Pickering26
- Richmond Hill26
- Timmins26
- Windsor26
- Kingston25
- Belleville24
- Brockville24
- Buckhorn24
- Caledon24
- Kenora District24
- Nepean24
- Amherstburg23
- Chatham23
- Kincardine23
- Parry Sound23
- Dorset22
- Newmarket22
- Brampton21
- Egbert21
- Port Stanley21
- Peterborough20
- Cornwall19
- Bonner Lake18
- Coldwater18
- Innisfil18
- London18
- Magnetawan18
- Merrickville-Wolford18
- Midland18
- Ottawa18
- Owen Sound18
- Sarnia18
- Waterloo18
- Aylmer17
- Niagara Falls17
- St. Thomas17
- Walpole Island17
- Ancaster16
- Binbrook16
- Brant16
- Cambridge16
- Fort Erie16
- Greater Sudbury16
- Ingersoll16
- Kenora16
- Norfolk County16
- Paris16
- Port Colborne16
- Simcoe16
- Thorold16
- Welland16
- Delaware15
- Camlachie14
- Lambton Shores14
- Mississauga14
- Petrolia14
- Stratford14
- Willowdale14
- Woodstock14
- Bluewater13
- Blyth13
- Concord13
- East Garafraxa13
- Goderich13
- Huron East13
- North Bay13
- North Perth13
- North York13
- Uxbridge13
- Wingham13
- Fort Frances12
- Atikokan11
- Etobicoke11
- Neebing11
- Sault Ste. Marie11
- Oshawa9
- Scarborough9
- Erin8
- Hanover8
- New Hamburg8
- Orangeville8
- Shelburne8
- Thunder Bay8
- Bancroft7
- Bourget7
- Casselman7
- Wendover7
- Angus6
- Arnprior6
- Bainsville6
- Barrie6
- Bracebridge6
- Carleton Place6
- Clarence-Rockland6
- Deep River6
- Deseronto6
- Dryden6
- Ear Falls6
- Elliot Lake6
- Embrun6
- Englehart6
- Espanola6
- Gananoque6
- Geraldton6
- Gravenhurst6
- Greater Napanee6
- Greenstone6
- Hearst6
- Hornepayne6
- Huntsville6
- Iroquois Falls6
- Kapuskasing6
- Keswick6
- Kirkland Lake6
- Little Current6
- Marathon6
- Markham6
- Mattawa6
- Minden Hills6
- Morrisburg6
- Napanee Downtown6
- Nestor Falls6
- Omemee6
- Petawawa6
- Pickle Lake6
- Picton6
- Port Elmsley6
- Powassan6
- Prescott6
- Prince Edward6
- Rayside-Balfour6
- Selwyn6
- Skatepark6
- Smiths Falls6
- South River6
- Temiskaming Shores6
- Thessalon6
- Tobermory6
- Wasaga Beach6
- Cobourg4
- Larder Lake4
- Orillia4
- Pembroke3
- Perth3
- South Huron3
- Almonte2
- Breslau2
- Quinte West2
- Renfrew2
- Algoma1
- Red Lake1
- Sioux Narrows1
- Ajax0
- Bells Corners0
- Collingwood0
- Lindsay0
