U.S. Environmental Protection AgencyOffice of Air Quality, Planning and Standards
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AQI Colors

These are the AQI colors. Each day the AQI is one of these colors. The colors tell you how healthy the air is to breathe that day. The colors go from Green to Yellow to Orange to Red to Purple to Maroon, each color telling you that the air is less clean than the color before. Green is the best air quality.

When the AQI is green,the air is clean!

We see a lot of Yellow, Orange, and Red AQI colors in the summer when air quality often isn't at its best. Purple and Maroon are the worst air quality! Luckily we hardly ever see the AQI get to Purple. Because of people working to clean up the air, the AQI has not reached Maroon in many years! This is why Maroon is usually not shown with the AQI.

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