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Government of Canada / Gouvernement du Canada

Air Quality Health Index for Ontario


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

 
FLCN21 CWTO 281000
Air Quality Health Index forecast for Ontario issued jointly by
Environment Canada and the Province of Ontario at 6:00 a.m. EDT
Tuesday 28 April 2026 for today and Wednesday.
The next scheduled forecast will be issued at 5:00 p.m. EDT.

Toronto
Toronto East
Toronto North
Toronto West
Windsor
Windsor Downtown
Windsor West
St. Catharines
Hamilton
Hamilton Downtown
Hamilton Mountain
Hamilton West
Burlington
Oakville
Mississauga.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 3 or low risk.
Wednesday night..Maximum Air Quality Health Index 3 or low risk.

Toronto Downtown.
Today..Maximum Air Quality Health Index 4 or moderate risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 4 or moderate risk.
Wednesday night..Maximum Air Quality Health Index 3 or low risk.

Chatham
Sarnia
Port Stanley
London
Grand Bend
Tiverton
Brantford
Kitchener
Guelph
Milton
Brampton
Oshawa
Newmarket
Barrie
Peterborough
Dorset
Parry Sound
Belleville
Kingston
Cornwall
Ottawa
Gatineau
North Bay.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.
Wednesday night..Maximum Air Quality Health Index 2 or low risk.

Sudbury
Sault Ste. Marie
Thunder Bay.
Today..Maximum Air Quality Health Index 3 or low risk.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.
Wednesday 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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