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Intense smoke fills NYC and forces a 'code red' in Philadelphia as
Indoor Air Pollution Linked to Heart Disease - News Center
Smoke From West Coast Wildfires Spreads to the East Coast - The New York Times
New Mass. air quality alert over Canada smoke – NBC Boston
See smoke in the air? Dept. of Agriculture conducting test fires in Scio, Silverton areas
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Air quality OK in P.E.I. for now, but Islanders urged to monitor
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Poor air quality reported across Alberta as wildfire smoke lingers
Wildfire smoke wreaks havoc on St. Louis air quality levels
Wildfire smoke has led to 'high levels of air pollution' in
