Ontario Pollen Forecast
Live pollen counts, AQHI air quality, and weather across Ontario, Canada — for parents, outdoor planners, and anyone managing seasonal allergies. Updated hourly.
About the AQHI (Air Quality Health Index)
Canada uses the Air Quality Health Index (AQHI), a 1-10+ scale developed by Environment Canada. It's the number you see on weather.gc.ca and on local news. Lower is better.
- 1-3 — Low Risk: Ideal air quality for outdoor activities
- 4-6 — Moderate Risk: Consider reducing strenuous outdoor exercise if you have asthma
- 7-10 — High Risk: Limit outdoor time, especially for children and those with respiratory conditions
Cities in Ontario
Largest Canadian metro
Toronto, Ontario
See today's pollen and AQHI →
Ontario's Allergy Season
Ontario's pollen season typically runs from April through October. Tree pollen (maple, birch, oak, alder) leads in April-May, grass pollen peaks in June-July, and ragweed dominates August through first frost — often into mid-October across southern Ontario. Long winters keep early-year counts low, but spring melt triggers a fast ramp-up.
Looking for Canadian cities outside Ontario? Browse all provinces →
Looking for Ontario, California (the city in San Bernardino County, USA)? See the Ontario, CA city page →