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Gathering pollen, air quality, and weather data for you.
Pollen Level
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Air Quality
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Toronto's pollen season runs from April through October, with three main allergen waves. Long winters keep early-year counts low, but spring melt triggers a fast tree-pollen ramp-up across Toronto, Ontario.
Right now: October winds down ragweed in Toronto. First frost typically ends the season; mould spores can rise in damp weather.
Spring
Apr – Jun
Tree pollen from birch, maple, oak, and alder. Birch is a leading trigger in central Canada.
Summer
Jun – Aug
Grass pollen peaks in June and July — timothy, ryegrass, and Kentucky bluegrass dominate.
Fall
Aug – Oct
Ragweed is the dominant fall allergen across southern Canada — pollen can travel hundreds of kilometres.
Conditions vary across Toronto — urban heat islands tend to extend pollen seasons by 1-2 weeks. PollenTracker uses live data plus the official Canadian AQHI scale so the air-quality number matches what you'd see on WeatherCAN or your local news.
Open another nearby forecast without going back to the map.
YES
Conditions are manageable, but it's breezy. Most people can head out with light precautions.
Pollen: Tree pollen risk is low today; source reading: Google UPI 0/5 (None).
Best hours: 13:00-15:00
Pollen Level
None
Google UPI 0/5 · Tree
Weather
17°C
Overcast · 86% humidity · 24 km/h wind
Google UPI 0/5
Google UPI 0/5
Google UPI 0/5