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

Table 7-6: California 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)
Alameda San Francisco Bay Area 99 00 01 NA Other1 Whole 1,443,741
Butte Chico 95 96 97 98 99 00 01 NA Chapter 185A Whole 203,171
Contra Costa San Francisco Bay Area 99 00 01 NA Other1 Whole 948,816
El Dorado Sacramento Metro 95 96 97 98 99 00 01 NA Severe-15 Part 124,164
Fresno San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 799,407
Imperial Imperial County 95 96 97 98 99 00 01 NA Chapter 185A Whole 142,361
Kern East Kern County 01 NA Serious Part 129,374
Kern San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Part 532,271
Kings San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 129,461
Los Angeles Los Angeles South Coast Air Basin 95 96 97 98 99 00 01 NA Extreme Part 9,270,321
Los Angeles Southeast Desert Modified AQMA 95 96 97 98 99 00 01 NA Severe-17 Part 249,017
Madera San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 123,109
Marin San Francisco Bay Area 99 00 01 NA Other1 Whole 247,289
Merced San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 210,554
Monterey Monterey Bay 95 96 3/18/97 Moderate Whole 401,762
Napa San Francisco Bay Area 99 00 01 NA Other1 Whole 124,279
Orange Los Angeles South Coast Air Basin 95 96 97 98 99 00 01 NA Extreme Whole 2,846,289
Placer Sacramento Metro 95 96 97 98 99 00 01 NA Severe-15 Part 239,978
Riverside Los Angeles South Coast Air Basin 95 96 97 98 99 00 01 NA Extreme Part 1,320,379
Riverside Southeast Desert Modified AQMA 95 96 97 98 99 00 01 NA Severe-17 Part 171,692
Sacramento Sacramento Metro 95 96 97 98 99 00 01 NA Severe-15 Whole 1,223,499
San Benito Monterey Bay 95 96 3/18/97 Moderate Whole 53,234
San Bernardino Los Angeles South Coast Air Basin 95 96 97 98 99 00 01 NA Extreme Part 1,506,524
San Bernardino Southeast Desert Modified AQMA 95 96 97 98 99 00 01 NA Severe-17 Part 113,335
San Diego San Diego 95 96 97 98 99 00 01 NA Serious Whole 2,813,833
San Francisco San Francisco Bay Area 99 00 01 NA Other1 Whole 776,733
San Joaquin San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 563,598
San Mateo San Francisco Bay Area 99 00 01 NA Other1 Whole 707,161
Santa Barbara Santa Barbara-Santa Maria-Lompoc 95 96 97 98 99 00 01 NA Serious Whole 399,347
Santa Clara San Francisco Bay Area 99 00 01 NA Other1 Whole 1,682,585
Santa Cruz Monterey Bay 95 96 3/18/97 Moderate Whole 255,602
Solano Sacramento Metro 95 96 97 98 99 00 01 NA Severe-15 Part 197,034
Solano San Francisco Bay Area 99 00 01 NA Other1 Part 197,508
Sonoma San Francisco Bay Area 99 00 01 NA Other1 Part 413,716
Stanislaus San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 446,997
Sutter Sacramento Metro 95 96 97 98 99 00 01 NA Severe-15 Part 25,013
Sutter Yuba City 95 96 97 98 99 00 01 NA Chapter 185A Part 53,917
Tulare San Joaquin Valley 95 96 97 98 99 00 01 NA Severe-15 Whole 368,021
Ventura Ventura County 95 96 97 98 99 00 01 NA Severe-15 Whole 753,197
Yolo Sacramento Metro 95 96 97 98 99 00 01 NA Severe-15 Whole 168,660
Yuba Yuba City 95 96 97 98 99 00 01 NA Chapter 185A Whole 60,219

1On July 10, 1998, EPA published the final rule redesignating the San Francisco Bay Area to nonattainment with the federal 1-hour ozone national ambient air quality standard (NAAQS). EPA did not assign the Bay Area a classification. On July 22, 1999, EPA published a final rule assigning the area a nonattainment classification as moderate for purposes of funding appropriation under the Transportation Equity Act for the 21st Century (TEA 21), Congestion Mitigation and Air Quality improvement Program (CMAQ) only.

KEY: NA = not applicable.

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 ppm and above; Severe-17 = design value of 0.190 up to 0.280 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 January 1, 1987, and ending on December 31, 1989.

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