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You are at:Home » Wildfire smoke linked to rise in ER visits for asthma: study
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Wildfire smoke linked to rise in ER visits for asthma: study

By favofcanada.caMay 5, 2025No Comments2 Mins Read
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By Nicole Ireland

The Canadian Press

Posted May 5, 2025 7:25 am

Updated May 5, 2025 7:26 am

1 min read

A new study says visits to emergency departments for asthma spiked during a first wave of unprecedented wildfire smoke in 2023, but patient numbers returned to normal during a second wave weeks later.

The researchers say the first wave may have served as a wake-up call so people learned to protect themselves from poor air quality before the wildfire smoke struck again.

Lead author Hong Chen says patients may have received preventive medications that helped keep their asthma under control and prepared themselves for the second wave by staying indoors and using air cleaners.

The researchers analyzed emergency department visits in Ontario in June 2023 because that was the worst wildfire season the province had ever experienced.

The study, published in the Canadian Medical Association Journal on Monday, comes as wildfire season has already begun in British Columbia.

In an accompanying commentary, Sarah Henderson of the BC Centre for Disease Control says wildfire smoke is the new normal and Canada needs indoor air quality standards to protect people.


&copy 2025 The Canadian Press

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