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Air Quality Successes - Air Emissions

Texas’ air quality has made huge strides in the past few decades. The state has devoted significant resources for air monitoring and research to advance the science and find innovative ways to improve air quality.

Emissions Trends - Statewide and by Area

Texas Point Source NOx Emissions and Ozone Design Value Trend Chart

Texas NOX Emissions

  • Between 2000 and 2023, Nitrogen Oxides (NOX) emissions decreased 73% and measured ground level ozone concentrations decreased 26%.
  • Emissions data reported by sites that met the TCEQ reporting requirements as stated in 30 Texas Administrative Code, Section 101.10 for the given year. The latest complete annual emissions data is 2023.
  • Ozone design values from EPA's Air Quality System (AQS).
  • All data current as of 2/20/2025.
* Design values are ambient-monitored values that are health-based and established by the EPA. More info
Texas Point Source VOC Emissions and Ozone Design Value Trend Chart

Texas VOC Emissions

  • Between 2000 and 2023, Volatile Organic Compound (VOC) emissions decreased 50% and measured ground level ozone concentrations decreased 26%.
  • Emissions data reported by sites that met the TCEQ reporting requirements as stated in 30 Texas Administrative Code, Section 101.10 for the given year. The latest complete annual emissions data is 2023.
  • Ozone design values from EPA's Air Quality System (AQS).
  • All data current as of 2/20/2025.
* Design values are ambient-monitored values that are health-based and established by the EPA. More info
Texas Point Source SO2 Emissions Trend Chart

Texas SO2 Emissions

  • Between 2000 and 2023, Sulfur Dioxide (SO2) emissions decreased 81%.
  • Emissions data reported by sites that met the TCEQ reporting requirements as stated in 30 Texas Administrative Code, Section 101.10 for the given year. The latest complete annual emissions data is 2023.
  • All data current as of 2/20/2025.
* Design values are ambient-monitored values that are health-based and established by the EPA. More info
Texas Point Source NOx Trend Chart by Metropolitan Area

Texas Area NOX Trends

  • Since 2000 NOX emissions have decreased by 78% in the Houston-Galveston-Brazoria (HGB) 8-county area, 70% in the Dallas-Fort Worth (DFW) 10-county area, 60% in the Beaumont-Port Arthur (BPA) 3-county area, 62% in the San Antonio 1-county area, and 39% in the El Paso 1-county area.
  • 30 Texas Administrative Code, Chapter 117 NOX rules went into effect in 1999.
  • Emissions data reported by sites that met the TCEQ reporting requirements as stated in 30 Texas Administrative Code, Section 101.10 for the given year. The latest complete annual emissions data is 2023.
  • All data current as of 2/20/2025.
* Design values are ambient-monitored values that are health-based and established by the EPA. More info
Texas Metropolitan Area Point Source VOC Trend Chart

Texas Area VOC Trends

  • Since 2000 VOC emissions have decreased by 53% in the Houston-Galveston-Brazoria (HGB) 8-county area, 30% in the Dallas-Fort Worth (DFW) 10-county area, 47% in the Beaumont-Port Arthur (BPA) 3-county area, 12% in the San Antonio 1-county area, and 29% in the El Paso 1-county area.
  • 30 Texas Administrative Code, Chapter 115 Highly Reactive VOC rules went into effect in 2003.
  • Emissions data reported by sites that met the TCEQ reporting requirements as stated in 30 Texas Administrative Code, Section 101.10 for the given year. The latest complete annual emissions data is 2023.
  • All data current as of 2/20/2025.
* Design values are ambient-monitored values that are health-based and established by the EPA. More info
Texas Metropolitan Area Point Source SO2 Trend Chart

Texas Area SO2 Trends

  • Since 2000 SO2 emissions have decreased by 68% in the Houston-Galveston-Brazoria (HGB) 8-county area, 81% in the Dallas-Fort Worth (DFW) 10-county area, 57% in the Beaumont-Port Arthur (BPA) 3-county area, 95% in the San Antonio 1-county area, and 69% in the El Paso 1-county area.
  • Emissions data reported by sites that met the TCEQ reporting requirements as stated in 30 Texas Administrative Code, Section 101.10 for the given year. The latest complete annual emissions data is 2023.
  • All data current as of 2/20/2025.
* Design values are ambient-monitored values that are health-based and established by the EPA. More info