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Air Quality Health Index for Ontario


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

 
FLCN21 CWTO 152100
Air Quality Health Index forecast for Ontario issued jointly by
Environment Canada and the Province of Ontario at 5:00 p.m. EDT
Friday 15 May 2026 for tonight Saturday and Sunday.
The next scheduled forecast will be issued at 6:00 a.m. EDT Saturday.

Toronto
Toronto Downtown
Toronto East
Toronto North
Toronto West.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 3 or low risk.

Windsor
Windsor Downtown
Windsor West.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 3 or low risk.

Chatham
Sarnia
Grand Bend.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Port Stanley
London
Tiverton
Brantford
Kitchener
Guelph
Hamilton
Hamilton Downtown
Hamilton Mountain
Hamilton West
Milton
Newmarket
Barrie
Dorset
Ottawa
Gatineau
Sudbury
Sault Ste. Marie.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

St. Catharines.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Burlington.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Oakville.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Mississauga.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 3 or low risk.

Brampton.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 3 or low risk.

Oshawa.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Peterborough.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Parry Sound.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 2 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Belleville.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 3 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Kingston.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 2 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Cornwall.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 3 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

North Bay.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 2 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..Maximum Air Quality Health Index 2 or low risk.

Thunder Bay.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Saturday..Maximum Air Quality Health Index 2 or low risk.
Saturday night..Maximum Air Quality Health Index 2 or low risk.
Sunday..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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