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Even though significant improvements in ambient ozone concentrations have been realized in the past decade in Texas, TCEQ is pursuing additional emission reductions of NOX and VOC because U.S. EPA has continued to tighten the ozone National Ambient Air Quality Standard. As TCEQ targets industrial and non-industrial sources for emissions reductions, you can play a role in the control strategy process.

TCEQ is currently working with stakeholders as it moves forward to develop attainment demonstration State Implementation Plan (SIP) revisions to bring Texas ozone nonattainment areas into compliance with U.S. EPA’s eight-hour ozone standard. The Dallas-Fort Worth Photochemical Modeling Technical Committee (DFWPMTC) and Southeast Texas Photochemical Modeling Committee (SETPMTC) are TCEQ advisory groups organized to assist the agency in addressing technical and scientific issues relating to air quality modeling for the Dallas-Fort Worth (DFW) and Houston/Galveston/Brazoria (HGB) and Beaumont/Port Arthur (BPA) areas. The Committees meet periodically, are open to the public, and include representatives from industry, environmental groups, and county and city government agencies.

Presently TCEQ is preparing and refining the emission inventories employed in its base case and baseline photochemical computer models. TCEQ uses photochemical models to estimate source apportionments and identify how much ozone is coming from outside Texas, from within Texas but outside the local nonattainment area, and from sources located within the nonattainment area. TCEQ also estimates the impact from specific sectors. Sectors that TCEQ evaluates include on-road and non-road mobile sources, point sources (examples include power plants, cement kilns, oil & gas operations, chemical plants, general manufacturing), area sources, and biogenic sources. TCEQ will ultimately develop its control strategies (and associated SIP regulations) based on the photochemical modeling.

The next scheduled meeting for the DFWPMTC is November 5. The SETPMTC is scheduled to meet on October 14 and December 16. Information for both committees is available at: