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Air Quality Health Index for Ontario


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

 
FLCN21 CWTO 122100
Air Quality Health Index forecast for Ontario issued jointly by
Environment Canada and the Province of Ontario at 5:00 p.m. EDT
Monday 12 October 2026 for tonight Tuesday and Wednesday.
The next scheduled forecast will be issued at 6:00 a.m. EDT Tuesday.

Toronto
Toronto Downtown
Toronto East
Toronto North
Toronto West
Mississauga
Brampton.
Tonight..Maximum Air Quality Health Index 4 or moderate risk.
Tuesday..Maximum Air Quality Health Index 4 or moderate risk.
Tuesday night..Maximum Air Quality Health Index 4 or moderate risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Windsor
Windsor Downtown
Windsor West.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Tuesday..Maximum Air Quality Health Index 4 or moderate risk.
Tuesday night..Maximum Air Quality Health Index 4 or moderate risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Chatham
Sarnia
Port Stanley
London
Grand Bend.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Tuesday..Maximum Air Quality Health Index 3 or low risk.
Tuesday night..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Tiverton
Barrie.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Tuesday..Maximum Air Quality Health Index 3 or low risk.
Tuesday night..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Brantford
Kitchener
Guelph
St. Catharines.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Tuesday..Maximum Air Quality Health Index 3 or low risk.
Tuesday night..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Hamilton
Hamilton Downtown
Hamilton Mountain
Hamilton West
Burlington
Oakville
Milton.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Tuesday..Maximum Air Quality Health Index 3 or low risk.
Tuesday night..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Oshawa
Newmarket
Peterborough
Belleville.
Tonight..Maximum Air Quality Health Index 3 or low risk.
Tuesday..Maximum Air Quality Health Index 3 or low risk.
Tuesday night..Maximum Air Quality Health Index 3 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Dorset
Parry Sound
Kingston
Cornwall
Ottawa
Gatineau
North Bay
Sudbury
Sault Ste. Marie.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Tuesday..Maximum Air Quality Health Index 2 or low risk.
Tuesday night..Maximum Air Quality Health Index 2 or low risk.
Wednesday..Maximum Air Quality Health Index 2 or low risk.

Thunder Bay.
Tonight..Maximum Air Quality Health Index 2 or low risk.
Tuesday..Maximum Air Quality Health Index 2 or low risk.
Tuesday night..Maximum Air Quality Health Index 2 or low risk.
Wednesday..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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