Air Quality Health Index (AQHI)

Air Quality Health Index Categories, Values and Associated Colours
Air Quality Health Index Categories and Values
1
2
3
4
5
6
7
8
9
10
+
Low Risk
(1 - 3)		 Moderate Risk
(4 - 6)		 High Risk
(7 - 10)		 Very High Risk
 

AQHI Observations and Forecasts

  • Current AQHI calculated at 11:00 pm EST November 21, 2024
  • Environment Canada location AQHI forecasts updated at 5:00 pm EST November 21, 2024
Current and Forecast Air Quality Health Index for Ontario
LocationCurrentForecast Maximums
Thursday, 11:00 pm Thursday NightFriday
Barrie
 2
Low Risk
 2
Low Risk
 2
Low Risk
Belleville
 1
Low Risk
 2
Low Risk
 2
Low Risk
Brampton
 2
Low Risk
 3
Low Risk
 2
Low Risk
Brantford
 1
Low Risk
 2
Low Risk
 2
Low Risk
Burlington
 2
Low Risk
 2
Low Risk
 2
Low Risk
Chatham
 1
Low Risk
 2
Low Risk
 2
Low Risk
Cornwall
 1
Low Risk
 2
Low Risk
 2
Low Risk
Dorset
 1
Low Risk
 2
Low Risk
 2
Low Risk
Grand Bend
 2
Low Risk
 2
Low Risk
 2
Low Risk
Guelph
 2
Low Risk
 2
Low Risk
 2
Low Risk
Hamilton Downtown
 2
Low Risk
 2
Low Risk
 2
Low Risk
Hamilton Mountain
 1
Low Risk
 2
Low Risk
 2
Low Risk
Hamilton West
 2
Low Risk
 2
Low Risk
 2
Low Risk
Kingston
 1
Low Risk
 2
Low Risk
 2
Low Risk
Kitchener
 2
Low Risk
 2
Low Risk
 2
Low Risk
London
 2
Low Risk
 2
Low Risk
 2
Low Risk
Milton
 2
Low Risk
 2
Low Risk
 2
Low Risk
Mississauga
 2
Low Risk
 3
Low Risk
 2
Low Risk
Newmarket
 2
Low Risk
 3
Low Risk
 2
Low Risk
North Bay
 1
Low Risk
 2
Low Risk
 2
Low Risk
Oakville
 2
Low Risk
 3
Low Risk
 2
Low Risk
Oshawa
 2
Low Risk
 2
Low Risk
 2
Low Risk
Ottawa Downtown
 1
Low Risk
 2
Low Risk
 2
Low Risk
Parry Sound
 1
Low Risk
 2
Low Risk
 2
Low Risk
Peterborough
 1
Low Risk
 2
Low Risk
 2
Low Risk
Port Stanley
 1
Low Risk
 2
Low Risk
 2
Low Risk
Sarnia
 1
Low Risk
 2
Low Risk
 2
Low Risk
Sault Ste. Marie
 1
Low Risk
 2
Low Risk
 2
Low Risk
St. Catharines
 2
Low Risk
 2
Low Risk
 2
Low Risk
Sudbury
 1
Low Risk
 2
Low Risk
 2
Low Risk
Thunder Bay
 1
Low Risk
 2
Low Risk
 2
Low Risk
Tiverton
 2
Low Risk
 2
Low Risk
 2
Low Risk
Toronto Downtown
 3
Low Risk
 3
Low Risk
 2
Low Risk
Toronto East
 3
Low Risk
 3
Low Risk
 2
Low Risk
Toronto North
 2
Low Risk
 3
Low Risk
 2
Low Risk
Toronto West
 2
Low Risk
 3
Low Risk
 2
Low Risk
Windsor Downtown
 2
Low Risk
 2
Low Risk
 2
Low Risk
Windsor West
 2
Low Risk
 2
Low Risk
 2
Low Risk

Air Quality Health Index Categories and Health Messages

The table below provides the health messages for each category of the Air Quality Health Index for the "at risk" population and the general population.
Health Risk Air Quality Health Index Health Messages
At Risk Population* General Population
Low 1 - 3 Enjoy your usual outdoor activities. Ideal air quality for outdoor activities.
Moderate 4 - 6 Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms. No need to modify your usual outdoor activities unless you experience symptoms such as coughing and throat irritation.
High 7 - 10 Reduce or reschedule strenuous activities outdoors. Children and the elderly should also take it easy. Consider reducing or rescheduling strenuous activities outdoors if you experience symptoms such as coughing and throat irritation.
Very High Above 10 Avoid strenuous activities outdoors. Children and the elderly should also avoid outdoor physical exertion. Reduce or reschedule strenuous activities outdoors, especially if you experience symptoms such as coughing and throat irritation.

* People with heart or breathing problems are at greater risk. Follow your doctor's usual advice about exercising and managing your condition.

Environment and Climate Change Canada website for AQHI readings and forecasts: https://www.canada.ca/en/environment-climate-change/services/air-quality-health-index.html

You can also get AQHI readings from recorded telephone messages by dialing 1-800-387-7768 (toll-free) or 416-246-0411 in Toronto.

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