Canada Pollen & AQHI Forecast
Live pollen counts, Air Quality Health Index (AQHI), and weather for major Canadian cities. Get a clear daily YES, CAUTION, or NO answer on whether it's safe to head outside.
Browse by Province
More provinces coming soon
Quebec, Manitoba, Saskatchewan, Nova Scotia, New Brunswick, Newfoundland and the territories are next. In the meantime, you can browse the full city map for the cities we cover today.
Why the AQHI?
Canada uses the Air Quality Health Index (AQHI) — a 1-10+ scale built by Environment Canada — rather than the US EPA's 0-500 AQI. The AQHI blends ozone, NO₂, and fine particulate matter (PM2.5) into one risk number that matches what you'll see on weather.gc.ca and local news.
Our Canadian city pages display the AQHI directly so the number matches your other sources. Lower is better — anything 1-3 is generally fine for outdoor activity, 4-6 means moderate caution for sensitive groups, and 7+ means most people should reduce outdoor time.
Canada's Allergy Season
Canadian pollen season runs roughly April through October, with three main waves: tree pollen (April-June, led by birch and maple), grass pollen (June-August), and ragweed (August-October, peaking in September). Western provinces tend to see shorter, more compressed seasons; central and eastern Canada see the longest ragweed exposure. Long winters delay the start, but warm springs can compress the tree pollen ramp-up into 2-3 intense weeks.
Pollen data: Google Pollen API. Air quality: Google Air Quality API (returns the native Canadian AQHI via Environment Canada). Weather: Open-Meteo and WeatherAPI.com. Updated hourly. Informational only — not medical advice. For health concerns, please consult a qualified healthcare provider.