Wildfires are destroying decades of clean air efforts in the U.S.
Air quality alert in Philly from wildfire smoke
Air quality in parts of Northwestern Ontario impacted by Alberta
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Wildfire Air Quality Impacts
Tips for removing the smell of smoke from the air and clothes
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Wildfire smoke has led to 'high levels of air pollution' in
Wildfire smoke triggers air quality warning in London region
Air Pollution Goes Back Way Further Than You Think, Science