Ontario - Air Quality Health Index - Summary

Choose a province or territory

Forecast Regions

This table is a summary of air quality health messages by category
Health Risk	Air Quality Health Index	Health Messages
Health Risk	Air Quality Health Index	At Risk Population*	General Population
Low Risk	1-3	Enjoy your usual outdoor activities.	Ideal air quality for outdoor activities.
Moderate Risk	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 Risk	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 Risk	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.

This table shows a summary of current Air Quality Health Index values and forecast maximums¹
Location and sub-locations	Observed Conditions	Forecast Maximums
Location and sub-locations	Observed Conditions	Saturday night	Sunday	Sunday night	Monday
Barrie	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Belleville	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Brampton	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Brantford	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Burlington	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Chatham	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Cornwall	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Dorset	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Grand Bend	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Guelph	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Hamilton	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Hamilton Downtown	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Hamilton Mountain	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Hamilton West	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Kingston	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Kitchener	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
London	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Milton	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Mississauga	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Newmarket	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
North Bay	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Oakville	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Oshawa	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Ottawa	3 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Parry Sound	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Peterborough	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Port Stanley	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Sarnia	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	3 Low Risk
Sault Ste. Marie	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
St. Catharines	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Sudbury	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Thunder Bay	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Tiverton	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk	2 Low Risk
Toronto	2 Low Risk	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Toronto Downtown	3 Low Risk	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Toronto East	2 Low Risk	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Toronto North	2 Low Risk	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Toronto West	2 Low Risk	2 Low Risk	3 Low Risk	3 Low Risk	3 Low Risk
Windsor	2 Low Risk	3 Low Risk	2 Low Risk	3 Low Risk	2 Low Risk
Windsor Downtown	2 Low Risk	3 Low Risk	2 Low Risk	3 Low Risk	2 Low Risk
Windsor West	2 Low Risk	3 Low Risk	2 Low Risk	3 Low Risk	2 Low Risk

1. Forecast issued at: 5:00 PM EST Saturday 13 December 2025

How to use

Add to shortcuts
- Go to the desired page on the site, open the Weather shortcuts menu and click on the "Add to shortcuts" button
- Page name will display in the "Add this page" window, the name can be changed by highlighting the text and entering the desired name.
- Click on the "Save" button to add the link to the list
- Click on the "X" button to close the panel
Delete a link
- Click on the "Organize shortcuts" button
- Select the link to delete
- Click on the "Delete" button to remove the link from the list
- Click on the "Close" button to save the change
Move a link up/down the list
- Click on the "Organize shortcuts" button
- Click and hold the link and move to new location in the list
- Click on the "Close" button to save the change
Rename a link
- Click on the "Organize shortcuts" button
- Select the link to rename
- Click on the "Rename" button and change the link name
- Click the enter or tab key
- Click on the "Close" button to save the change
Keyboard navigation
- Use the Tab key to move to a button or link
- Use the Enter key to click on buttons or links
- Organize shortcuts navigation
  - Use the ↑ Up key to select the link above. If none are selected, it will select the first link
  - Use the ↓ Down key to select the link below. If none are selected, it will select the last link
  - Use the Page Up key to move a selection up in the list
  - Use the Page Down key to move a selection down in the list
Restore default list

Warning: Clicking on the button below will remove all your customized links.

Feedback about this web site

Date modified:: 2025-12-13

Language selection

Search

Ontario - Air Quality Health Index - Summary

Add this page

Ontario - Air Quality Health Index - Summary

No shortcuts

Add this page

Add to shortcuts

Rename shortcut

Add to shortcuts