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Division of Air Pollution Control

Tennessee Air Quality Forecasting Program

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Air Quality Index Color Code Reference

Air Quality Index Ozone Concentration (parts per billion) Weather
Conditions		 Health
Effects		 Recommended
Actions
Good

Good


AQI: 0-50 (Green)		 0-64 Cool summer temperatures Windy conditions Significant cloud cover Heavy or steady precipitation No health effects are expected
    Keep cars and boats tuned up Use environmentally safe paints and cleaning products Conserve electricity-set A/C to highest comfortable level
Moderate

Moderate


AQI: 51-100 (Yellow)		 65-84
    Temperatures in the upper 70's to lower 80's Light to moderate winds Partly cloudy to mostly sunny skies Chance of rain or afternoon thunderstorms

Unusually sensitive people should consider limiting prolonged outdoor exertion Unhealthy for Sensitive Groups
Unhealthy for Sensitive Groups

Unhealthy for Sensitive Groups


AQI: 101-150 (Orange)		 85-104
    Temperatures in the 80's and 90's Light winds Mostly sunny skies Slight chance of afternoon thunderstorms

Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion
    Limit daytime driving Limit vehicle driving Refuel vehicles after dusk Don't "top off" your gas tank Avoid congested areas Use water-based paints Use transit or car pool Use newest/best maintained car Combine trips and share rides Postpone using gasoline mowers Barbecue without starter fluid
Unhealthy

Unhealthy
AQI: 151-200 (Red)


 105-124
    Hot, hazy, and humid Stagnant air Sunny skies Little chance of precipitation
Active children and adults, and people with respiratory disease such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion.
Very Unhealthy

Very Unhealthy


AQI: 201-300 (Purple)		 125 and above
    Hot and very hazy Extremely stagnant air Sunny skies No precipitation
The weather conditions listed above are common weather types associated with the respective air quality level. A combination of part or of all these weather conditions could lead to a certain level of observed air quality.