Table 7-6: Texas Air Quality Nonattainment Areas for Ozone (O3)

Table 7-6: Texas Air Quality Nonattainment Areas for Ozone (O3)

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County Area Nonattainment in year Redesignation to attainment Classification Part or whole county Population (2000)
Brazoria Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 241,767
Chambers Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 26,031
Collin Dallas-Fort Worth 95 96 97 98 99 00 01 NA Serious Whole 491,675
Dallas Dallas-Fort Worth 95 96 97 98 99 00 01 NA Serious Whole 2,218,899
Denton Dallas-Fort Worth 95 96 97 98 99 00 01 NA Serious Whole 432,976
El Paso El Paso 95 96 97 98 99 00 01 NA Serious Whole 679,622
Fort Bend Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 354,452
Galveston Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 250,158
Hardin Beaumont-Port Arthur 95 96 97 98 99 00 01 NA Moderate Whole 48,073
Harris Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 3,400,578
Jefferson Beaumont-Port Arthur 95 96 97 98 99 00 01 NA Moderate Whole 252,051
Liberty Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 70,154
Montgomery Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 293,768
Orange Beaumont-Port Arthur 95 96 97 98 99 00 01 NA Moderate Whole 84,966
Tarrant Dallas-Fort Worth 95 96 97 98 99 00 01 NA Serious Whole 1,446,219
Waller Houston-Galveston-Brazoria 95 96 97 98 99 00 01 NA Severe-17 Whole 32,663

KEY: NA = not applicable; U = data are unavailable.

NOTES: Nonattainment areas do not meet the national primary or secondary ambient air quality standard (NAAQS) for the specified pollutant. Nonattainment areas are classified based on design values: Extreme = design value of 0.280 parts per million (ppm) and above; Severe-17 = design value of 0.190 up to 0.280 parts per million (ppm) and has 17 years to reach attainment; Severe-15 = design value of 0.180 up to 0.190 ppm and has 15 years to reach attainment; Serious = design value of 0.160 up to 0.180 ppm; Moderate = design value of 0.138 up to 0.160 ppm; Marginal = design value of 0.121 up to 0.138 ppm; Section 185A = an area designated as an ozone nonattainment area as of the date of enactment of the Clean Air Act Amendments of 1990 and has not violated the national primary ambient air quality standard for ozone for the 36-month period commencing on Jan. 1, 1987, and ending on Dec. 31, 1989.

SOURCE: U.S. Environmental Protection Agency, Green Book, available at http://www.epa.gov/oar/oaqps/greenbk/anay.html as of Apr. 20, 2002.