Check the air quality in Louisville

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The Air Quality Index (AQI) tells how clean or polluted your outdoor air is, and what associated health effects might be a concern for you. The EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act, but the primary focus in Kentuckiana is ground-level ozone (O3) and particle pollution (PM2.5).

AQI Level Value Related Health Concerns
Good 0-50 Air quality is considered satisfactory, and air pollution poses little or no risk.
Moderate 51-100 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups 101-150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy 151-200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy 201-300 Health alert: everyone may experience more serious health effects.
Hazardous > 300 Health warnings of emergency conditions. The entire population is more likely to be affected.

APCD uses the current conditions along with meteorological data to forecast air quality as far as four days ahead. See the air quality forecasts page for more information on this topic.

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