AQHI Forecast:


Forecast Issued on:
March 18, 2024


Forecast: Ontario's Air Quality Health Index

  • Environment Canada location AQHI forecasts updated at 5:00 pm EDT March 18, 2024.

Air Quality Health Index (AQHI) Categories

Air Quality Health Index Categories, Values and Associated Colours
Air Quality Health Index Categories and Values
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
 
Note:
  • The Air Quality Health Index on this web page are based on automatically polled data and have not undergone final verification.
  • N/A (Not Available) denotes invalid or missing data.

Air Quality Health Index Categories and Health Messages

The table below provides the health messages for each category of the Air Quality Health Index for the "at risk" population and the general population.
Health Risk Air Quality Health Index Health Messages
At Risk Population* General Population
Low 1 - 3 Enjoy your usual outdoor activities. Ideal air quality for outdoor activities.
Moderate 4 - 6 Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms. No need to modify your usual outdoor activities unless you experience symptoms such as coughing and throat irritation.
High 7 - 10 Reduce or reschedule strenuous activities outdoors. Children and the elderly should also take it easy. Consider reducing or rescheduling strenuous activities outdoors if you experience symptoms such as coughing and throat irritation.
Very High Above 10 Avoid strenuous activities outdoors. Children and the elderly should also avoid outdoor physical exertion. Reduce or reschedule strenuous activities outdoors, especially if you experience symptoms such as coughing and throat irritation.

* People with heart or breathing problems are at greater risk. Follow your doctor's usual advice about exercising and managing your condition.

Environment and Climate Change Canada website for AQHI readings and forecasts: https://www.canada.ca/en/environment-climate-change/services/air-quality-health-index.html

You can also get AQHI readings from recorded telephone messages by dialing 1-800-387-7768 (toll-free) or 416-246-0411 in Toronto.