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Air Quality Successes - Criteria Pollutants

The TCEQ diligently incorporates the latest scientific research, methods, models and cutting-edge technology to strategically investigate, evaluate, and improve air quality. This page highlights Texas' air quality improvements despite its growing population.
From 2000 to 2012, ozone levels in Texas have decreased by 23 Percent
click to view full size chart
  • The rest of the nation averaged an 11% decrease in ozone levels.
  • The eight-hour ozone levels for the Houston-Galveston-Brazoria (HGB) and Dallas–Fort Worth (DFW) nonattainment areas have been trending downward for the 1997 eight-hour NAAQS since 2000.
  • As of 2008, Beaumont–Port Arthur, San Antonio, and El Paso ozone levels are below the 1997 ozone standard.
  • The EPA has designated the El Paso area to be in attainment of the 1997 ozone standard.
  • The EPA has redesignated the Beaumont area in attainment of the 1997 ozone standard.
   - based on ozone design value as defined by EPA
Click on main image to view larger chart.
  • Ozone Trends: Bar Chart
  • Ozone Trends: Map
  • Metro Areas
  • O3 Concentrations
  • Houston vs LA
  • Houston vs LA AQI
  • Unhealthy Days