The US EPA PM2.5 Air Quality Index (AQI) is a number used by US government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to become.
Purple Air provides our AQI data, and the sensor values are corrected to meet EPA PM2.5 standards.
Color dots go from Green to Yellow to Orange to Red to Purple to Maroon and the numbers range from 0 to 500.
Enable or Disable the AQI Map Layer
- Tap the Layers button
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Toggle the Air Quality Index (AQI) layer under the Weather section.
| 0-50 Air quality is satisfactory, and air pollution poses little or no risk with 24 hours of exposure. |
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| 51-100 Air quality is acceptable. However, there may be a risk for some people with 24 hours of exposure, particularly those who are unusually sensitive to air pollution. |
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| 101-150 Members of sensitive groups may experience health effects with 24 hours of exposure. The general public is less likely to be affected. |
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| 151-200 Some members of the general public may experience health effects with 24 hours of exposure; members of sensitive groups may experience more serious health effects. |
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| 201-300 Health alert: The risk of health effects is increased for everyone with 24 hours of exposure. |
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| 301 and Higher Higher Health warning of emergency conditions: everyone is more likely to be affected with 24 hours of exposure. |