Toronto North - Air Quality Health Index

Observed ConditionsFootnote †

Calculated at: 10:00 PM EST Thursday 4 December 2025

3Low 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:

  • Ideal air quality for outdoor activities.

Forecast Maximums

Issued at: 5:00 PM EST Thursday 4 December 2025

Thursday night

4 - Moderate Risk

Friday

4 - Moderate Risk

Friday night

3 - Low Risk

Saturday

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...?

You can play a part in reducing air pollution. Many car trips are less than 3 kilometres: an average person can cycle 3 kilometres in under 15 minutes.


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

AQHIScale

Observed ConditionsFootnote †


3 - Low Risk

Calculated at:

10:00 PM EST Thursday 4 December 2025

 

Forecast Maximums


Thursday night
4 - Moderate Risk



Friday
4 - Moderate Risk



Friday night
3 - Low Risk



Saturday
3 - Low Risk




Issued at:

5:00 PM EST Thursday 4 December 2025

 

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

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