The Air Quality Index has five color-coded categories that measures pollutants including ozone, particulate matter and carbon monoxide. Some parts of New York City and Philadelphia reported Code Purple air qualities early Wednesday.
The categories are part of the U.S. Air Quality Index, which is the Environmental Protection Agency’s index for measuring and reporting air quality. The index measures five major pollutants regulated by the Clean Air Act: ground-level ozone, particulate matter including PM2.5 and PM10, carbon monoxide, sulfur dioxide and nitrogen dioxide., saying it “lets you know when you may want to change your outdoor activities to reduce the amount of air pollution you breathe in.” The higher the U.S.
An Air Quality Index value of 50 or below represents good air quality — Code Green. Code Yellow signifies moderate concern, while Code Orange means that the AQI is between 101 and 150, and while
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