Canada braces for tougher allergy season as pollen levels rise

TL;DR Summary
Canadian researchers say pollen levels across the country have doubled in recent years, driven by warmer weather and shifting seasons, worsening allergies from hay fever to hives. With cedar, maple, birch, oak and poplar pollen overlapping this spring and urban heat islands amplifying the effect, experts say the season may be more intense in 2026. People are advised to limit outdoor activity and keep windows closed on high-pollen days to manage symptoms.
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