Guelph: current Air Quality Health Index (AQHI)

Calculated at 5:00 am EST Thursday, January 1, 2026

2

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 Guelph

• Forecast Air Quality Health Index maximums for Guelph
• Issued at: 5:00 pm EST December 31, 2025

Forecast Air Quality Health Index maximums for Guelph

Period	Forecast maximum (Issued at 5:00 pm EST December 31, 2025)
Wednesday	3 - Low Risk
Wednesday night	3 - Low Risk
Thursday	3 - Low Risk

Health message for Guelph

• Current Air Quality Health Index: 2
• Calculated at 5:00 am EST Thursday, January 1, 2026
• Risk: Low

At-risk population:

• Enjoy your usual outdoor activities.
• Find out if you are at risk

General population:

• Ideal air quality for outdoor activities.

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.