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Air Quality Index

Monitored gases and weather data from the continuous air monitoring stations (CAMS) are used by the TCEQ to publish near real time Air Pollution Watches and Warnings. In addition, the data is used to determine an Air Quality Index (AQI), a numerical and color value indicator of current air quality. This value is updated hourly and available on the TCEQ website.

AQI reports are reported during daily weather forecasts by most of the local TV and radio stations. 

Air Quality Index
Levels of Health Concern		 Numerical
Value		 Meaning
Good (Green) 0-50 Air quality is considered satisfactory, and air pollution poses little or no risk.
Moderate (Yellow) 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 (Orange) 101-150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy (Red) 151-200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy (Purple) 201-300 Health alert: everyone may experience more serious health effects.
Hazardous (Maroon)  >300 Health warnings of emergency conditions. The entire population is more likely to be affected.

 

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