Air quality alerts use color-coded categories to show when pollution levels may be unhealthy. Code Orange is unhealthy for sensitive groups, while Code Red is unhealthy for everyone. Code Purple means ...
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What is Code Purple? See air quality map for Pennsylvania
Wildfire smoke from Canada and Minnesota has led to a Code Purple alert for Pennsylvania on July 17. See the air quality map.
When an air quality alert is announced, here are what the code colors mean and what the health dangers are as Canadian wildfire reaches Delaware.
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