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Forecast

Source forecast for Toronto.

Periods appear at the level of detail provided by GeoMet.

No current source forecast is available.

The number, explained

AQHI is a health-risk index—not a measurement of one pollutant. It helps translate the conditions into a simple choice about your day.

“The number is a cue to adjust your plans, not a grade for the city.”

Toronto-wide AQHI · not neighbourhood-level exposure

Protect yourself

Practical ways to reduce exposure, after the warning and official guidance.

Make indoor air cleaner: Close windows and doors when smoke is present. Use a portable air cleaner in the room where you spend the most time.
Choose a well-fitting mask: For outdoor smoke exposure, a well-fitting particulate-filtering respirator can reduce the particles you breathe in.
Plan around the conditions: Move strenuous activity indoors, shorten outdoor time, or choose a lower-exertion route when the AQHI is high.

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Common questions

What is AQHI?

The Air Quality Health Index is a health-risk scale that helps explain what outdoor air quality can mean for your activities.

What is PM2.5?

PM2.5 refers to very small airborne particles. Smoke can contain high concentrations of these particles.

How bad is wildfire smoke?

Smoke can affect people differently. AQHI and official advisories are useful signals for deciding how to adjust outdoor plans.