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 10:00 am EDT March 23, 2023
• Environment Canada location AQHI forecasts updated at 6:00 am EDT March 23, 2023

Current and Forecast Air Quality Health Index for Ontario

Location	Current	Forecast Maximums
	Thursday, 10:00 am	Thursday	Thursday Night	Friday
Barrie	3 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Belleville	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Brampton	4 Moderate Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Brantford	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Burlington	3 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Chatham	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Cornwall	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Dorset	2 Low Risk	3 Low Risk	3 Low Risk	2 Low Risk
Grand Bend	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Guelph	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Hamilton Downtown	3 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Hamilton Mountain	2 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Hamilton West	2 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Kingston	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Kitchener	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
London	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Milton	3 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Mississauga	3 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Newmarket	2 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
North Bay	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Oakville	4 Moderate Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Oshawa	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Ottawa Downtown	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Parry Sound	2 Low Risk	3 Low Risk	3 Low Risk	2 Low Risk
Peterborough	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Port Stanley	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Sarnia	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Sault Ste. Marie	2 Low Risk	3 Low Risk	3 Low Risk	2 Low Risk
St. Catharines	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Sudbury	2 Low Risk	3 Low Risk	3 Low Risk	2 Low Risk
Thunder Bay	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Tiverton	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Toronto Downtown	3 Low Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Toronto East	4 Moderate Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Toronto North	4 Moderate Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Toronto West	4 Moderate Risk	4 Moderate Risk	3 Low Risk	3 Low Risk
Windsor Downtown	3 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Windsor West	3 Low Risk	3 Low Risk	3 Low Risk	3 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.