Texas Commission on Environmental Quality (TCEQ)

EPA designated the counties of Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant and Wise in the Dallas-Fort Worth area as moderate nonattainment for ozone. In addition, 8 counties in the Houston-Galveston-Brazoria area classified as moderate nonattainment for ozone including Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery and Waller.

The City of El Paso and portions of El Paso County were designated as moderate nonattainment for PM10. Nonattainment areas for SO2 include parts of Anderson, Freestone, Panola, Rusk and Titus Counties.

TCEQ’s Emission Banking and Trading Program facilitates trading of ERCs within the state. ERCs are available for six different pollutants:​

Pollutant County or Area Major Source
Emission Rates
Major Source
Modification
Emission Rates
Nitrogen oxides (NOx) DFW (10 counties, 2008 standard)
and HGB (8 counties, 2008 standard)
>100 tons/year >40 tons/year
Volatile organic compounds (VOC) DFW (10 counties, 2008 standard)
and HGB (8 counties, 2008 standard)
>100 tons/year >40 tons/year
Sulfur oxides (SOx) Portions of Freestone, Anderson,
Rusk, Panola, and Titus Counties (2010 standard)
>100 tons/year >40 tons/year
Carbon monoxide (CO) >100 tons/year >100 tons/year
PM10 City of El Paso >100 tons/year >15 tons/year
PM2.5 >10 tons/year >10 tons/year

To satisfy offset requirements, new or modified major facilities in the nonattainment areas must obtain ERCs to satisfy the offset ratio requirements for proposed emission increases. The offset ratio for Dallas-Fort Worth and Houston-Galveston-Brazoria classified as moderate nonattainment areas for ozone is 1.15. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in the above-mentioned counties classified as marginal nonattainment for ozone, the facility must obtain 115 tpy of ERCs to offset the increase in VOC emissions.

Similarly, offset ratio for a moderate nonattainment area for PM10 is 1.15. Thus, for 100 tpy of PM10 emitted from a proposed new or modified major facility in the city and county of El Paso, the facility must obtain 115 tpy of ERCs to offset the increase in PM10 emissions.

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