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Air Quality
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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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Hamilton'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 Hamilton, Ontario.
Right now: July is sustained grass pollen in Hamilton. Heat and dry spells push counts higher; thunderstorms can cause sudden symptom spikes.
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 Hamilton — 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
Grass pollen is moderate with calm conditions. Most people can head out comfortably.
Air quality: AQI is 11 (very-unhealthy).
Best hours: 11:00, 19:00-20:00
Weather
22°C
Sunny · 66% humidity · 11 km/h wind
~5 grains/m³
~5 grains/m³