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III. Environmental Setting, Impacts, and Mitigations G. Air Quality 45 percent of the time)at an average speed of about ten miles per hour(California Air Resources Board, 1989). Air Quality Rules, Regu1 ti ns and Standards Federal Regulation of air quality is achieved through both federal and state ambient air.quality standards and emissions limits for individual sources of air pollutants. The federal Clean Air Act(CAA) required the U.S. Environmental Protection Agency(EPA)to identify National Ambient Air Quality Standards(NAAQS)to protect public health and welfare. NAAQS have been established for the six "criteria" air pollutants,ozone(03),carbon monoxide(CO),nitrogen dioxide(NOD,sulfur dioxide (SO2),respirable particulate matter(PM10),and lead(Pb). These pollutants are called"criteria" air pollutants because these standards satisfy criteria specified under the Clean Air Act. Pursuant to the 1990 CAA Amendments,the EPA has classified Air Basins,or portions thereof, as either"attainment "or"non-attainment" for each criteria air pollutant,based on whether or not the NAAQS have been achieved. 03 non-attainment areas are categorized as "extreme", "severe," "serious," "moderate," or"marginal." The CO and PM10 non-attainment regions are divided into "serious" and "moderate" classifications. The San Joaquin Valley Air Basin (SJVAB),which includes San Joaquin County,has been classified as "moderate" non-attainment for 03,and PM10(Kwong, 1993). The Valley is in attainment status for CO, NO2,Pb, and SO2. As required by the 1977 CAA Amendments,the Air Districts for the eight separate counties submitted plans to be incorporated into the California State Implementation Plan(SIP) (Kwong, 1993). These plans described the air pollution control strategies necessary to bring each Air District into attainment for all of the NAAQS by 1987. The 1990 federal Clean Air Act Amendments require that,within two or three years of enactment(November 15, 1990),the State submit to the EPA a revised SIP. In accordance with SIP requirements,the San Joaquin Valley Unified Air Pollution Control District(SJVUAPCD)submitted a PM10 plan in 1991,a CO non- attainment area plan in 1992,and is scheduled to submit a plan for 03 attainment by November 1993. The EPA found deficiencies in the PM10 plan,and the SJVUAPCD is currently revising that document. The EPA has not had the time yet to comment on the CO plan(Kwong, 1993). III.G.2