MAP: Track the air quality across the US
By Byron Manley, Curt Merrill and Renée Rigdon, CNN (CNN) — Millions of people across the Northeast, Midwest and mid-Atlantic are under air quality alerts as wildfire smoke originating from Canada wafts over major US cities. Over 400 fires were still burning across Canada Wednesday afternoon, according to Minister of Emergency Preparedness Bill Blair. More than 9
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