Toronto Downtown - Air Quality Health Index

Calculated at: 3:00 PM EDT Friday 25 July 2025

4Moderate Risk




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



At-Risk Population:

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 Friday 25 July 2025

Friday

3 - Low Risk

Friday night

3 - Low Risk

Saturday

3 - Low Risk

Saturday night

3 - Low 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...?

Children are more vulnerable to air pollution: they spend more active time outdoors, especially in summer when pollution levels are higher.


The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.