What is causing air quality warnings in northern US?
Smoke from wildfires in Canada is moving into parts of the central US and could linger in the days ahead, health and weather officials warned. CNN meteorologist Allison Chinchar reports.
What is causing air quality warnings in northern US?
Smoke from wildfires in Canada is moving into parts of the central US and could linger in the days ahead, health and weather officials warned. CNN meteorologist Allison Chinchar reports.
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