Toronto Downtown - Air Quality Health Index
Calculated at: 1:00 AM EDT Thursday 19 March 2026
4Moderate Risk
2
3
4
5
6
7
8
9
10
+
Moderate Risk
(4-6)
High Risk
(7-10)
Very High Risk
At-Risk Population:
- Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms.
- Find out if you are at risk
General Population:
- No need to modify your usual outdoor activities unless you experience symptoms such as coughing and throat irritation.
Issued at: 6:00 AM EDT Wednesday 18 March 2026
Wednesday
4
- Moderate Risk
Wednesday night
3
- Low Risk
Thursday
3
- Low Risk
Thursday night
4
- Moderate Risk
Who is at risk?
People with heart and lung conditions are most affected by air pollution.
To find out if you are at risk, consult the health guide, or your physician.
Visit the national AQHI Web site to learn more about the AQHI.
Did you know...?
If you're a diabetic, you may be at increased risk from air pollution.
The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.
