Ontario - Air Quality Health Index - Summary

AQHIScale
Forecast Regions

This table shows a summary of current Air Quality Health Index values and forecast maximums1
Location and sub-locations Observed Conditions Forecast Maximums
Thursday Thursday night Friday Friday night
Barrie 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Belleville 2
Low Risk		 4
Moderate Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Brampton 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Brantford 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Burlington 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Chatham 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Cornwall 2
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Dorset 1
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Grand Bend 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Guelph 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Hamilton 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Kingston 2
Low Risk		 4
Moderate Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Kitchener 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
London 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Milton 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Mississauga 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Newmarket 3
Low Risk		 4
Moderate Risk		 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk
North Bay 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Oakville 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Oshawa 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Ottawa 2
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Parry Sound 2
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Peterborough 2
Low Risk		 4
Moderate Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Port Stanley 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Sarnia 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Sault Ste. Marie 2
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
St. Catharines 2
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Sudbury 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Thunder Bay 3
Low Risk		 2
Low Risk		 2
Low Risk		 2
Low Risk		 2
Low Risk
Tiverton 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk		 3
Low Risk
Toronto 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
4
Moderate Risk		 5
Moderate Risk		 5
Moderate Risk		 5
Moderate Risk		 5
Moderate Risk
4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
Windsor 3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk
3
Low Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk		 4
Moderate Risk

1. Forecast issued at: 6:00 AM EDT Thursday 4 June 2026

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