Hamilton Mountain - Air Quality Health Index
Calculated at: 5:00 PM EDT Monday 4 May 2026
4Moderate Risk
2
3
4
5
6
7
8
9
10
+
Moderate Risk
(4-6)
High Risk
(7-10)
Very High Risk
At-Risk Population:
- Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms.
- Find out if you are at risk
General Population:
- No need to modify your usual outdoor activities unless you experience symptoms such as coughing and throat irritation.
Issued at: 5:00 PM EDT Monday 4 May 2026
Monday night
4
- Moderate Risk
Tuesday
3
- Low Risk
Tuesday night
3
- Low Risk
Wednesday
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...?
The single most energy consuming means of travel is the plane. The cheapest and least polluting way to travel long distances is to take the train or bus.
The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.
