Here's how Canadian wildfires are worsening air quality across the U.S.
Briefly

Dozens of wildfires are burning in the Canadian province of Quebec, and the smoke is so bad that it's causing air quality problems across large swaths of the U.S. The National Weather Service said air quality has "plummeted" across the Northeast.Officials from the Midwest to the East Coast and as far south as North Carolina are warning residents to take precautions as the hazy smoke floats south and poses a risk to public health.
Read at www.npr.org
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