Hamilton Downtown - Air Quality Health Index

Observed ConditionsFootnote †

Calculated at: 10:00 PM EST Tuesday 17 February 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 EST Tuesday 17 February 2026

Tuesday night

5 - Moderate Risk

Wednesday

3 - Low Risk

Wednesday night

2 - Low Risk

Thursday

2 - 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...?

After a labour dispute shut down an American steel mill, respiratory hospital admissions in children substantially decreased. They increased to pre-strike levels when it ended.


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 Tuesday 17 February 2026

 

Forecast Maximums


Tuesday night
5 - Moderate Risk



Wednesday
3 - Low Risk



Wednesday night
2 - Low Risk



Thursday
2 - Low Risk




Issued at:

5:00 PM EST Tuesday 17 February 2026

 

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

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