St. Catharines - Air Quality Health Index

Observed ConditionsFootnote †

Calculated at: 10:00 PM EDT Wednesday 3 June 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: 5:00 PM EDT Wednesday 3 June 2026

Wednesday night

3 - Low Risk

Thursday

4 - Moderate Risk

Thursday night

4 - Moderate Risk

Friday

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, your physician, or your local health authority.

Visit the national AQHI Web site to learn more about the AQHI.

Did you know...?

Even when you can't see it or smell it, air pollution can still be a threat.


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 EDT Wednesday 3 June 2026

 

Forecast Maximums


Wednesday night
3 - Low Risk



Thursday
4 - Moderate Risk



Thursday night
4 - Moderate Risk



Friday
4 - Moderate Risk




Issued at:

5:00 PM EDT Wednesday 3 June 2026

 

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

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