Air Quality Health Index (AQHI)

The Air Quality Health Index replaced the Air Quality Index on June 24, 2015. For more information about the new AQHI index, see What is the Air Quality Health Index?

Air Quality Health Index Categories, Values and Associated Colours
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 3:00 am EDT August 2, 2015
  • Environment Canada location AQHI forecasts updated at 5:00 pm EDT August 1, 2015
  • Ontario Ministry of Environment and Climate Change location AQHI forecasts updated at 3:00 pm EDT July 31, 2015.
  • Note: Forecasts by Ontario Ministry of Environment and Climate Change are marked with "*". All other forecasts are by Environment Canada.
  • See Current AQI Readings for Ontario
Current and Forecast Air Quality Health Index for Ontario
LocationCurrentForecast Maximums
Sunday, 3:00 am Saturday NightSunday
Barrie
 1
Low Risk
 2
Low Risk
 3
Low Risk
Belleville*
2
Low Risk
3*
Low Risk
N/A
Brampton
 2
Low Risk
 2
Low Risk
 3
Low Risk
Brantford*
2
Low Risk
3*
Low Risk
N/A
Burlington
 2
Low Risk
 2
Low Risk
 3
Low Risk
Chatham*
2
Low Risk
3*
Low Risk
N/A
Cornwall*
2
Low Risk
2*
Low Risk
N/A
Dorset
 1
Low Risk
 2
Low Risk
 2
Low Risk
Grand Bend*
1
Low Risk
3*
Low Risk
N/A
Guelph*
1
Low Risk
3*
Low Risk
N/A
Hamilton Downtown
 2
Low Risk
 3
Low Risk
 4
Moderate Risk
Hamilton Mountain
 2
Low Risk
 3
Low Risk
 4
Moderate Risk
Hamilton West
 2
Low Risk
 3
Low Risk
 4
Moderate Risk
Kingston
 2
Low Risk
 2
Low Risk
 3
Low Risk
Kitchener*
N/A
3*
Low Risk
N/A
London
 1
Low Risk
 2
Low Risk
 3
Low Risk
Mississauga
 1
Low Risk
 2
Low Risk
 3
Low Risk
Newmarket
 2
Low Risk
 2
Low Risk
 3
Low Risk
North Bay*
N/A
2*
Low Risk
N/A
Oakville
 2
Low Risk
 2
Low Risk
 3
Low Risk
Oshawa
 1
Low Risk
 2
Low Risk
 3
Low Risk
Ottawa Central
 1
Low Risk
 2
Low Risk
 3
Low Risk
Ottawa Downtown
 1
Low Risk
 2
Low Risk
 3
Low Risk
Parry Sound*
2
Low Risk
3*
Low Risk
N/A
Petawawa*
1
Low Risk
2*
Low Risk
N/A
Peterborough
 2
Low Risk
 2
Low Risk
 3
Low Risk
Port Stanley*
2
Low Risk
3*
Low Risk
N/A
Sarnia*
3
Low Risk
3*
Low Risk
N/A
Sault Ste. Marie
 1
Low Risk
 2
Low Risk
 2
Low Risk
St. Catharines
 2
Low Risk
 3
Low Risk
 3
Low Risk
Sudbury*
2
Low Risk
2*
Low Risk
N/A
Thunder Bay*
1
Low Risk
2*
Low Risk
N/A
Tiverton*
2
Low Risk
3*
Low Risk
N/A
Toronto Downtown
 2
Low Risk
 3
Low Risk
 4
Moderate Risk
Toronto East
 3
Low Risk
 3
Low Risk
 4
Moderate Risk
Toronto North
 2
Low Risk
 3
Low Risk
 4
Moderate Risk
Toronto West
 2
Low Risk
 3
Low Risk
 4
Moderate Risk
Windsor Downtown
 3
Low Risk
 3
Low Risk
 4
Moderate Risk
Windsor West
 3
Low Risk
 3
Low Risk
 4
Moderate Risk

* Forecast of AQHI Health Risk provided by Ontario Ministry of Environment and Climate Change

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.