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6800 Burleson Road
Building 310, Suite 165
Austin, TX 78744

T:  (512) 916-6000
F: (512) 916-6001

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Ozone Watch-Warning System

What is an Ozone Watch?
What is an Ozone Warning?
Air Quality Index

What is an Ozone Watch?

An "Air Pollution Watch" for ground-level ozone is issued by the Texas Commission on Environmental Quality (TCEQ) a day in advance when conditions are forecasted to be favorable for high ozone levels and therefore have the potential to pose a public health risk. The watch is issued so that citizens, businesses, and industry can take steps to reduce the pollutants that contribute to ground-level ozone formation.

What is an Ozone Warning?

An Ozone Warning means that high levels of ozone are currently being measured at one or more monitoring sites in the Central Texas area. The TCEQ issues public notifications via e-mail to local authorities, news organizations, and interested citizens within approximately 30 minutes after ozone measurements reach unhealthy levels.

More details on the Ozone Watch-Warnings system can be be found on the TCEQ's Web site at the following links:
Ozone Watch-Warning System
Current Ozone Levels - Austin-Round Rock MSA
Current Ozone Levels - Texas
Current Ozone Watches or Warnings
Ozone Forecasts
Sign up for ozone email alerts

Air Quality Index

The Air Quality Index (AQI), established by the U.S. EPA, is used for reporting daily air quality.  The AQI reports pollution levels and what effects those levels could have on public health.  The AQI levels have been calculated for five major pollutants regulated by the Clean Air Act:  ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. Ground-level ozone and particulate matter are the two pollutants that pose the greatest threat to human health in the U.S.

The AQI is divided into six categories with values ranging from 0 to 500.  The higher the AQI value, the greater the level of pollution, thus an increased concern for public health.


TCEQ Link:
Today's Air Quality Report

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