Poor air quality caused by Canadian wildfires has continued to affect large swathes of North America, with nearly a third of United States residents warned of unhealthy conditions.Air quality warnings on Thursday stretched from Wisconsin and northern Illinois across Michigan and into New York and the East Coast, according to the US National Weather Service.Meanwhile, the US Environmental Protection Agency’s real-time air quality map showed “unhealthy” air from the Midwest border with Canada down to North Carolina and Tennessee. Pockets of “very unhealthy” air were recorded over the cities of Madison, Wisconsin, Cedar Rapids, Iowa and Lansing, Michigan.
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