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Air Quality Successes - Criteria Pollutants

Texas has devoted significant resources to air quality monitoring and research during the past decade in order to better understand air quality and to develop effective controls when needed.

From 2000 to 2013, ozone levels in Texas have decreased by 24 Percent
click to view full size chart
  • The average for all states plus District of Columbia and Puerto Rico only showed a decrease of 12 percent.
  • 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 2013, eleven areas of the state with monitors have ozone levels that are below the 2008 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
  • Houston Design Values