Check Current Air Quality in Louisville

The Air Quality Index (AQI) is a scale used to convey the effect of local air quality on public health. 

The AQI represents the amount of an air pollutant on a scale from 0-500. The higher the value the greater the level of pollution and potential health risk. The values are sorted into six color-coded categories ranging from "Good" (1-50) to "Hazardous" (301-500). While there is no "healthy" amount of air pollution, any AQI value below 100 is considered to be acceptable for public health. 

Current Conditions


AQI Value Category & Description
1-50 Good: Air quality is satisfactory, and air pollution poses little or no risk to public health.
51-100 Moderate: Air quality is considered acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
101-150 Unhealthy for Sensitive Groups: Members of sensitive groups may experience health effects. Others are less likely to be affected.
151-200 Unhealthy: Any member of the general public may experience health effects; members of sensitive groups may experience more serious health effects
201-300 Very Unhealthy: Health alert. The risk of health effects is increased for everyone.
301 and above Hazardous: Health warning of emergency conditions. Everyone 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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