Air Quality Ontario: Table: Ontario's Air Monitoring Stations, AQHI

AQHI forecast for Sunday by stations.
Station	Location	AQHI	AQHI category
Windsor Downtown	467 University Ave. W.	N/A
Windsor West	College Ave. South St.	N/A
Chatham	435 Grand Ave. W.	2	low risk
Sarnia	700 Christina St. N.	2	low risk
London	42 St. Julien St.	N/A
Port Stanley	43665 Dexter Line, Elgin Water T. Plt	N/A
Tiverton	4th Concession, Bruce Rd. 23	N/A
Brantford	324 Grand River Ave.	N/A
Kitchener	West Ave. Homewood Ave.	2	low risk
St. Catharines	Argyle Cres., Pump Stn.	N/A
Guelph	Exhibition St. Clark St. W.	N/A
Hamilton West	Main St. W. Hwy 403	2	low risk
Hamilton Mountain	250 Fennell Ave. W.	N/A
Toronto Downtown	55 John St.	3	low risk
Toronto East	Kennedy Rd. Lawrence Ave. E.	N/A
Toronto North	4905 Dufferin St., Eccc	3	low risk
Toronto West	125 Resources Rd.	N/A
Burlington	North Shore Blvd. E. Lakeshore Rd.	N/A
Oakville	Eighth Line, Glenashton Dr., Halton Res.	N/A
Milton	1120 Main St. E.	2	low risk
Oshawa	Brittania Ave. W., Ep Taylor Stables	2	low risk
Brampton	109 Mclaughlin Rd. S.	N/A
Mississauga	3359 Mississauga Rd. N., U of T Campus	3	low risk
Barrie	83 Perry St.	N/A
Newmarket	Eagle St. W. McCaffrey Rd.	2	low risk
Parry Sound	7 Bay St.	N/A
Dorset	1026 Bellwood Acres Rd.	N/A
Ottawa Downtown	Rideau St. Wurtemburg St.	N/A
Kingston	23 Beechgrove Lane	2	low risk
Belleville	2 Sidney St., Water Treatment Plant	N/A
Cornwall	Bedford St. 3rd St. W.	N/A
Sault Ste. Marie	Sault College	2	low risk
Sudbury	155 Elm St.	N/A
Hamilton Downtown	Elgin St. Kelly St.	N/A
Grand Bend	Point Blake Conservation Area	N/A
Peterborough	10 Hospital Dr.	N/A
North Bay	Elgin St. Kelly St.	N/A

Forecast: Ontario's Air Quality Health Index

Environment and Climate Change Canada location AQHI forecasts updated at 5:00 pm EST December 6, 2025.

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

Note:

The Air Quality Health Index (AQHI) on this web page are based on automatically polled data and have not undergone final verification.
N/A (not available) denotes invalid or missing data.

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
Health risk	Air Quality Health Index	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.

AQHI readings and forecasts are also available on the Environment and Climate Change Canada website.

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