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 12:00 pm EDT September 2, 2015
  • Environment Canada location AQHI forecasts updated at 6:00 am EDT September 2, 2015
  • Ontario Ministry of Environment and Climate Change location AQHI forecasts updated at 9:00 am EDT September 2, 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
Wednesday, 12:00 pm WednesdayWednesday NightThursday
Barrie
 3
Low Risk
4
Moderate Risk
 4
Moderate Risk
 3
Low Risk
Belleville*
3
Low Risk
4*
Moderate Risk
4*
Moderate Risk
Brampton
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Brantford*
3
Low Risk
5*
Moderate Risk
4*
Moderate Risk
Burlington
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Chatham*
3
Low Risk
5*
Moderate Risk
4*
Moderate Risk
Cornwall*
3
Low Risk
3*
Low Risk
3*
Low Risk
Dorset
 2
Low Risk
4
Moderate Risk
 4
Moderate Risk
 3
Low Risk
Grand Bend*
3
Low Risk
5*
Moderate Risk
4*
Moderate Risk
Guelph*
3
Low Risk
4*
Moderate Risk
4*
Moderate Risk
Hamilton Downtown
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Hamilton Mountain
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Hamilton West
 3
Low Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Kingston
 3
Low Risk
4
Moderate Risk
 4
Moderate Risk
 3
Low Risk
Kitchener*
3
Low Risk
4*
Moderate Risk
4*
Moderate Risk
London
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Mississauga
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Newmarket
 4
Moderate Risk
4
Moderate Risk
 4
Moderate Risk
 3
Low Risk
North Bay*
3
Low Risk
3*
Low Risk
4*
Moderate Risk
Oakville
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Oshawa
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Ottawa Central
 2
Low Risk
4
Moderate Risk
 4
Moderate Risk
 3
Low Risk
Ottawa Downtown
 2
Low Risk
4
Moderate Risk
 4
Moderate Risk
 3
Low Risk
Parry Sound*
3
Low Risk
4*
Moderate Risk
4*
Moderate Risk
Petawawa*
3
Low Risk
3*
Low Risk
3*
Low Risk
Peterborough
 3
Low Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Port Stanley*
3
Low Risk
5*
Moderate Risk
4*
Moderate Risk
Sarnia*
4
Moderate Risk
5*
Moderate Risk
4*
Moderate Risk
Sault Ste. Marie
 4
Moderate Risk
4
Moderate Risk
 3
Low Risk
 3
Low Risk
St. Catharines
 3
Low Risk
5
Moderate Risk
 5
Moderate Risk
 4
Moderate Risk
Sudbury*
3
Low Risk
3*
Low Risk
4*
Moderate Risk
Thunder Bay*
1
Low Risk
3*
Low Risk
3*
Low Risk
Tiverton*
3
Low Risk
4*
Moderate Risk
4*
Moderate Risk
Toronto Downtown
 4
Moderate Risk
6
Moderate Risk
 6
Moderate Risk
 4
Moderate Risk
Toronto East
 5
Moderate Risk
6
Moderate Risk
 6
Moderate Risk
 4
Moderate Risk
Toronto North
 5
Moderate Risk
6
Moderate Risk
 6
Moderate Risk
 4
Moderate Risk
Toronto West
 5
Moderate Risk
6
Moderate Risk
 6
Moderate Risk
 4
Moderate Risk
Windsor Downtown
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 5
Moderate Risk
Windsor West
 4
Moderate Risk
5
Moderate Risk
 5
Moderate Risk
 5
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.