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Air quality changes from day to day. Many factors such as the pollution sources and concentration (i.e. wildfires, traffic etc.) and meteorology (i.e. winds, rains, etc.) affect the air quality.

For more information on how your device captures this information click the link below:
https://www.iqair.com/us/newsroom/what-is-aqi

Keywords: Air Quality, AirVisual Pro, AVP, AVO, pollutants, outdoor, comparison, day to day, AQI levels, weather, fires