Explainer-What are the health risks from wildfire smoke?
Canadian wildfires prompt new evacuations, alarm over air quality
From the US East Coast to the Canadian capital, millions will suffer unhealthy air quality today as wildfires in Quebec rage on
US states under air-quality alerts as Canadian smoke drifts south
Canada wildfires: Tens of millions under air quality warnings as fires burn
New York City's air pollution among the world's worst as Canada wildfire smoke shrouds Northeast
Canada could see its worst wildfire season on record
Wildfires spread in eastern Canada, forcing evacuations in coastal Quebec
Explainer-Why are wildfires raging in Canada's eastern Nova Scotia province?
Canada's military and US firefighters to aid Nova Scotia's wildfire fight
Nova Scotia battles its largest wildfire on record
‘California is meant to burn': Experts teach landowners art of prescribed burns
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