Ontario - Current Air Quality Health Index Observations and Forecasts Today's Air Quality Forecast jointly provided by the Ontario Ministry of the Environment, Conservation and Parks and Environment and Climate Change Canada.2026-05-20T21:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi:202605202100Ontario Ministry of the Environment, Conservation and Parks, Air Monitoring and Transboundary Air Sciences Sectionhttp://www.airqualityontario.comCopyright 2026, Ontario Ministry of the Environment, Conservation and Parks<![CDATA[Barrie: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-47045-1:202605202300<![CDATA[Barrie: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-47045-2:202605201700<![CDATA[Barrie: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-47045-2:202605201700<![CDATA[Belleville: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-54012-1:202605202300<![CDATA[Belleville: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-54012-2:202605201700<![CDATA[Belleville: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-54012-2:202605201700<![CDATA[Brampton: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-46090-1:202605202300<![CDATA[Brampton: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-46090-2:202605201700<![CDATA[Brampton: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-46090-3:202605201700<![CDATA[Brantford: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-21005-2:202605202300<![CDATA[Brantford: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-21005-3:202605201700<![CDATA[Brantford: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-21005-3:202605201700<![CDATA[Burlington: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-44008-2:202605202300<![CDATA[Burlington: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-44008-2:202605201700<![CDATA[Burlington: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-44008-2:202605201700<![CDATA[Chatham: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-13001-2:202605202300<![CDATA[Chatham: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-13001-2:202605201700<![CDATA[Chatham: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-13001-2:202605201700<![CDATA[Cornwall: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-56051-2:202605202300<![CDATA[Cornwall: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-56051-2:202605201700<![CDATA[Cornwall: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-56051-2:202605201700<![CDATA[Dorset: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-49010-1:202605202300<![CDATA[Dorset: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-49010-2:202605201700<![CDATA[Dorset: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-49010-2:202605201700<![CDATA[Grand Bend: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-15020-2:202605202300<![CDATA[Grand Bend: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-15020-2:202605201700<![CDATA[Grand Bend: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-15020-2:202605201700<![CDATA[Guelph: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-28028-2:202605202300<![CDATA[Guelph: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-28028-3:202605201700<![CDATA[Guelph: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-28028-3:202605201700<![CDATA[Hamilton Downtown: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-29000-2:202605202300<![CDATA[Hamilton Downtown: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-29000-2:202605201700<![CDATA[Hamilton Downtown: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-29000-2:202605201700<![CDATA[Hamilton Mountain: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-29214-2:202605202300<![CDATA[Hamilton Mountain: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-29214-2:202605201700<![CDATA[Hamilton Mountain: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-29214-2:202605201700<![CDATA[Hamilton West: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-29118-2:202605202300<![CDATA[Hamilton West: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-29118-2:202605201700<![CDATA[Hamilton West: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-29118-2:202605201700<![CDATA[Kingston: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-52023-1:202605202300<![CDATA[Kingston: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-52023-2:202605201700<![CDATA[Kingston: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-52023-2:202605201700<![CDATA[Kitchener: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-26060-2:202605202300<![CDATA[Kitchener: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-26060-3:202605201700<![CDATA[Kitchener: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-26060-3:202605201700<![CDATA[London: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-15026-2:202605202300<![CDATA[London: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-15026-2:202605201700<![CDATA[London: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-15026-3:202605201700<![CDATA[Milton: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-44029-2:202605202300<![CDATA[Milton: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-44029-2:202605201700<![CDATA[Milton: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-44029-2:202605201700<![CDATA[Mississauga: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-46108-2:202605202300<![CDATA[Mississauga: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-46108-2:202605201700<![CDATA[Mississauga: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-46108-3:202605201700<![CDATA[Newmarket: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-48006-1:202605202300<![CDATA[Newmarket: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-48006-2:202605201700<![CDATA[Newmarket: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-48006-2:202605201700<![CDATA[North Bay: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-75010-2:202605202300<![CDATA[North Bay: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-75010-2:202605201700<![CDATA[North Bay: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-75010-2:202605201700<![CDATA[Oakville: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-44017-2:202605202300<![CDATA[Oakville: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-44017-2:202605201700<![CDATA[Oakville: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-44017-2:202605201700<![CDATA[Oshawa: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-45027-1:202605202300<![CDATA[Oshawa: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-45027-2:202605201700<![CDATA[Oshawa: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-45027-2:202605201700<![CDATA[Ottawa Downtown: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-51001-2:202605202300<![CDATA[Ottawa Downtown: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-51001-2:202605201700<![CDATA[Ottawa Downtown: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-51001-2:202605201700<![CDATA[Parry Sound: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-49005-2:202605202300<![CDATA[Parry Sound: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-49005-2:202605201700<![CDATA[Parry Sound: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-49005-2:202605201700<![CDATA[Peterborough: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-59006-1:202605202300<![CDATA[Peterborough: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-59006-2:202605201700<![CDATA[Peterborough: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-59006-2:202605201700<![CDATA[Port Stanley: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-16015-2:202605202300<![CDATA[Port Stanley: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-16015-3:202605201700<![CDATA[Port Stanley: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-16015-3:202605201700<![CDATA[Sarnia: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-14111-2:202605202300<![CDATA[Sarnia: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-14111-2:202605201700<![CDATA[Sarnia: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-14111-2:202605201700<![CDATA[Sault Ste. Marie: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-71078-2:202605202300<![CDATA[Sault Ste. Marie: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-71078-2:202605201700<![CDATA[Sault Ste. Marie: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-71078-2:202605201700<![CDATA[St. Catharines: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-27067-2:202605202300<![CDATA[St. Catharines: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-27067-2:202605201700<![CDATA[St. Catharines: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-27067-2:202605201700<![CDATA[Sudbury: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-77233-2:202605202300<![CDATA[Sudbury: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-77233-2:202605201700<![CDATA[Sudbury: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-77233-2:202605201700<![CDATA[Thunder Bay: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-63200-2:202605202300<![CDATA[Thunder Bay: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-63200-2:202605201700<![CDATA[Thunder Bay: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-63200-2:202605201700<![CDATA[Tiverton: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-18007-2:202605202300<![CDATA[Tiverton: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-18007-2:202605201700<![CDATA[Tiverton: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-18007-2:202605201700<![CDATA[Toronto Downtown: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-31129-2:202605202300<![CDATA[Toronto Downtown: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-31129-2:202605201700<![CDATA[Toronto Downtown: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-31129-3:202605201700<![CDATA[Toronto East: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-33003-1:202605202300<![CDATA[Toronto East: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-33003-2:202605201700<![CDATA[Toronto East: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-33003-3:202605201700<![CDATA[Toronto North: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-34021-1:202605202300<![CDATA[Toronto North: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-34021-2:202605201700<![CDATA[Toronto North: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-34021-3:202605201700<![CDATA[Toronto West: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-35125-2:202605202300<![CDATA[Toronto West: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-35125-2:202605201700<![CDATA[Toronto West: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-35125-3:202605201700<![CDATA[Windsor Downtown: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-12008-2:202605202300<![CDATA[Windsor Downtown: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-12008-2:202605201700<![CDATA[Windsor Downtown: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-12008-2:202605201700<![CDATA[Windsor West: Current Observation]]>2026-05-20T23:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-12016-2:202605202300<![CDATA[Windsor West: Forecast Wednesday Night]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f2-12016-2:202605201700<![CDATA[Windsor West: Forecast Thursday]]>2026-05-20T17:00:00-04:00tag:airqualityontario.com,2026-05-20:ontario-aqhi-f3-12016-2:202605201700DisclaimerThis information is provided as a public service, but we cannot guarantee that it is current or accurate.
Readers should verify the information before acting on it.
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Copyright: King's Printer for Ontario, 2026tag:airqualityontario.com,2026-05-20:ontario-disclaimer:2026052021002026-05-20T21:00:00-04:00