Toronto Downtown: current Air Quality Health Index (AQHI)

Calculated at 6:00 am EDT Thursday, September 18, 2025

4

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

Forecast for Toronto Downtown

• Forecast Air Quality Health Index maximums for Toronto Downtown
• Issued at: 6:00 am EDT September 18, 2025

Forecast Air Quality Health Index maximums for Toronto Downtown

Period	Forecast maximum (Issued at 6:00 am EDT September 18, 2025)
Thursday	4 - Moderate Risk
Thursday night	4 - Moderate Risk
Friday	3 - Low Risk

Health message for Toronto Downtown

• Current Air Quality Health Index: 4
• Calculated at 6:00 am EDT Thursday, September 18, 2025
• Risk: Moderate

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.

See the Ontario Ministry of the Environment, Conservation and Parks air quality health messages.

Note: AQHI readings on this web page are based on automatically polled data and have not undergone final verification.