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Seasonal Allergies in Canada: What to Expect This Fall

·Sep 10, 2026
Source: The Weather Network
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Photo credit : Not ragweed: The main culprit behind your seasonal allergies this fall

About 25 percent of Canadians deal with seasonal allergies. Ragweed usually dominates the headlines in the fall, but this year is different. “We do anticipate that it will be a bit of a lighter season than last year,” says Daniel Coates, Director at Aerobiology Research Laboratories. “Probably about 70 per cent of the grains that we saw last year. "DON'T MISS: Canada's 2026 fall forecast calls for a pause on cold weatherThis is excellent news for residents of Ontario, Quebec, and Manitoba, as these provinces typically experience the highest levels of ragweed pollen. However, due to the excessive rain we've seen across the country this year, the allergy season will look and feel a little different. “Ragweed and all plants do love rain, but excessive amounts of rain will wash the pollen out of the air. Allergy sufferers do not get the typical symptoms that they usually experience since the pollen has been washed down to the ground and into the sewer systems or the grass, etc.,” explains Coates. RELATED: Do I have a cold or allergies? How to tell the differnceThis phenomenon, however, does not mean allergy season is cancelled.

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