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Air Quality Ontario

AQHI observations:

AQHI observations for Thursday, July 16, 2026, 7:00 pm by stations.
Station Location AQHIAQHI category
Barrie83 Perry St.4Moderate Risk, Barriemoderate risk
Belleville2 Sidney St., Water Treatment Plant6Moderate Risk, Bellevillemoderate risk
Brampton109 Mclaughlin Rd. S.10+Very High Risk, Bramptonvery high risk
Brantford324 Grand River Ave.10+Very High Risk, Brantfordvery high risk
BurlingtonNorth Shore Blvd. E./Lakeshore Rd.10+Very High Risk, Burlingtonvery high risk
Chatham435 Grand Ave. W.10+Very High Risk, Chathamvery high risk
CornwallBedford St./3rd St. W.2Low Risk, Cornwalllow risk
Dorset1026 Bellwood Acres Rd.3Low Risk, Dorsetlow risk
Grand BendPoint Blake Conservation Area10+Very High Risk, Grand Bendvery high risk
GuelphExhibition St./Clark St. W.10+Very High Risk, Guelphvery high risk
Hamilton DowntownElgin St./Kelly St.10+Very High Risk, Hamilton Downtownvery high risk
Hamilton Mountain250 Fennell Ave. W.10+Very High Risk, Hamilton Mountainvery high risk
Hamilton WestMain St. W./Hwy 40310+Very High Risk, Hamilton Westvery high risk
Kingston23 Beechgrove Lane4Moderate Risk, Kingstonmoderate risk
KitchenerWest Ave./Homewood Ave.10+Very High Risk, Kitchenervery high risk
London42 St. Julien St.10+Very High Risk, Londonvery high risk
Milton1120 Main St. E.10+Very High Risk, Miltonvery high risk
Mississauga3359 Mississauga Rd. N., U of T Campus10+Very High Risk, Mississaugavery high risk
NewmarketEagle St. W./McCaffrey Rd.7High Risk, Newmarkethigh risk
North BayChippewa St. W., Dept. National Defence2Low Risk, North Baylow risk
OakvilleEighth Line/Glenashton Dr., Halton Res.10+Very High Risk, Oakvillevery high risk
OshawaBrittania Ave. W., EP Taylor Stables8High Risk, Oshawahigh risk
Ottawa DowntownRideau St./Wurtemburg St.2Low Risk, Ottawa Downtownlow risk
Parry Sound7 Bay St.3Low Risk, Parry Soundlow risk
Peterborough10 Hospital Dr.6Moderate Risk, Peterboroughmoderate risk
Port Stanley43665 Dexter Line, Elgin Water T. Plt10+Very High Risk, Port Stanleyvery high risk
Sarnia700 Christina St. N.10+Very High Risk, Sarniavery high risk
Sault Ste. MarieSault College10High Risk, Sault Ste. Mariehigh risk
St. CatharinesArgyle Cres., Pump Stn.9High Risk, St. Catharineshigh risk
SudburyApplegrove St./Birch St.2Low Risk, Sudburylow risk
Thunder Bay615 James St. S., MTO10+Very High Risk, Thunder Bayvery high risk
Tiverton4th Concession/Bruce Rd. 2310+Very High Risk, Tivertonvery high risk
Toronto Downtown55 John St.10+Very High Risk, Toronto Downtownvery high risk
Toronto EastKennedy Rd./Lawrence Ave. E.10+Very High Risk, Toronto Eastvery high risk
Toronto North4905 Dufferin St., Eccc10+Very High Risk, Toronto Northvery high risk
Toronto West125 Resources Rd.10+Very High Risk, Toronto Westvery high risk
Windsor Downtown467 University Ave. W.10+Very High Risk, Windsor Downtownvery high risk
Windsor WestCollege Ave./South St.10+Very High Risk, Windsor Westvery high risk

Ontario's Air Quality Health Index

AQHI observations for Thursday, July 16, 2026, 7:00 pm


Air Quality Health Index (AQHI) categories

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.

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.

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.