Toronto Downtown - Air Quality Health Index

Observed ConditionsFootnote †

Calculated at: 1:00 PM EST Thursday 5 March 2026

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: 1:10 PM EST Thursday 5 March 2026

Thursday

4 - Moderate Risk

Thursday night

3 - Low Risk

Friday

3 - Low Risk

Friday 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...?

Climate change results in more frequent and severe heat waves, which make smog and air pollution worse.


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

AQHIScale

Observed ConditionsFootnote †


3 - Low Risk

Calculated at:

1:00 PM EST Thursday 5 March 2026

 

Forecast Maximums


Thursday
4 - Moderate Risk



Thursday night
3 - Low Risk



Friday
3 - Low Risk



Friday night
3 - Low Risk




Issued at:

1:10 PM EST Thursday 5 March 2026

 

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

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