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4.5 AIR QUALITY All of San Joaquin County is considered non-attainment for ozone under the federal Clean Air Act for ozone. The County is attainment for carbon monoxide, with the exception of urbanized Stockton. San Joaquin County is designated as a Group 2 area for PM-10 (attainment of the standard is uncertain). The County is either attainment or unclassified for other pollutants (California Air Resources Board, 1989). The federal Clean Air Act Amendments of 1990 require that attainment areas develop plans and strategies that will reduce pollutants by 15 percent during the first six years, then 3 percent annually until the standards are met. As required by this legislation, an attainment plan for PM-10 has been prepared by the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD, 1991a). A revised attainment plan for carbon monoxide is required to be adopted by November 1992; the attainment plan for ozone in November 1993. State Program The California Clean Air Act, enacted in 1988, requires local air pollution control districts to prepare air quality plans for ozone and carbon monoxide. Generally, these plans must provide for district-wide emission reductions of five per cent per year averaged over three-year periods. The Act also grants air districts explicit statutory authority to adopt indirect source regulations and transportation control measures, including measures to encourage or require the used of ridesharing, flexible work hours, or other measures that reduce the number or length of vehicle trips. Under the California Clean Air Act, San Joaquin County is considered non-attainment for ozone and PM-1C?. The Stockton urbanized area is considered non-attainment for carbon monoxide. The County is either attainment or unclassified for other pollutants under the California Clean Air Act. A draft of the state-required attainment plan for ozone and carbon monoxide has been recently released (SJVUAPCD, 1991b), and adoption of a final plan is scheduled for December 1991. Existing Air Quality The California Air Resources Board maintains three air quality monitoring sites within San Joaquin County, all in the Stockton area. A summary of air quality data from these monitoring sites is shown in Table 4.5-2 for the years 1987-1990. Table 4.5-2 shows that the standards for ozone, carbon monoxide and PM-10 are exceeded in the Stockton area. Levels of sulfur dioxide and nitrogen dioxide do not exceed either the state or federal standards. 4.5-4