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Air Quality Health Index for Ontario


* NOTE: Corrected and/or amended bulletins are listed first *

 
FLCN21 CWTO 211000
Air Quality Health Index forecast for Ontario issued jointly by
Environment Canada and the Province of Ontario at 6:00 a.m. EDT
Thursday 21 May 2026 for today and Friday.
The next scheduled forecast will be issued at 5:00 p.m. EDT.

Toronto.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Toronto Downtown.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Toronto East.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Toronto North.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Toronto West.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Windsor.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Windsor Downtown.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Windsor West.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Chatham.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Sarnia.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Port Stanley.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

London.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Grand Bend.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Tiverton.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Brantford.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Kitchener.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Guelph.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

St. Catharines.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Hamilton.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Hamilton Downtown.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Hamilton Mountain.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Hamilton West.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Burlington.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Oakville.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Milton.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Mississauga.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Brampton.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Oshawa.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Newmarket.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Barrie.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Peterborough.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Dorset.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Parry Sound.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Belleville.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Kingston.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Cornwall.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Ottawa.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Gatineau.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

North Bay.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Sudbury.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Sault Ste. Marie.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Thunder Bay.
Today..Maximum Air Quality Health Index 2 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Friday..Maximum Air Quality Health Index 2 or low risk.
Friday night..Maximum Air Quality Health Index 2 or low risk.

Air Quality Health Index Scale:
1-3  Low health risk
4-6  Moderate health risk
7-10 High health risk
Above 10 Very high health risk

For more information, consult www.airhealth.ca

End
$$$$^^

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