Maryland is under a Code Red air quality alert as wildfire smoke moves into the region, with Code Purple conditions expected ...

Canadian wildfire smoke has caused air quality in Washington DC to go beyond Code Red into Code Purple, "Very unhealthy" levels.

Wildfire smoke from Canada and Minnesota has led to a Code Purple alert for Pennsylvania on July 17. See the air quality map.

Philadelphia issued a "Code Red" air quality alert Thursday due to Canadian wildfire smoke, with air quality reaching "Very ...

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US air quality map: A Code Purple alert for poor air quality has been declared in Philadelphia due to smoke from wildfires in ...

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The Pennsylvania Department of Environmental Protection has declared a statewide Code Purple air quality alert for ...

The air quality in Lancaster County and the rest of Pennsylvania is “very unhealthy” as the entire state approaches the most ...