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Atmosphere temperature inversions are common in the South <br /> Coast Air Basin and inhibit the vertical dispersion of air pollution <br /> while they persist. As a result, air pollutants become more <br /> concentrated until the inversions either break or surface winds increase <br /> enough to disperse pollutants horizontally. <br /> Levels at which air pollution produces adverse health or <br /> welfare effects on receptors are reflected in the Ambient Air Quality <br /> Standards. The Federal and State Air Ouality Standards are represented <br /> in Table 17. The attainment of the Federal Primary Air Quality <br /> Standards is required by December 31, 1982,* but may be extended with <br /> EPA approval for carbon monoxide and oxidant to December 31, 1987. <br /> The California State Air Quality Standards were originally set as air <br />-~ quality goals and do not have a specific attainment date. In August, <br />- . 1982, the Southern California Air Quality Management District (SCAQMD) <br /> and the Southern California Association of Governments (SCAG) revised <br /> the Air Quality Management Plan (AQMP)/State Implementation Plan (SIP) <br /> for the South Coast Air Basin. The plan was required by the Federal <br /> Clean Air Act and its revised goal is to attain federal and state <br /> ambient air quality standards in the basin as expeditiously as <br /> practical. However, modeling shows that even with the implementation of <br /> all reasonable measures which can be realistically implemented in the <br /> next five years, the region can not demonstrate attainment by 1987. <br /> Therefore, a long range plan has been prepared which includes provisions <br /> for annual increments of progress and interim air quality goals leading <br /> to the attainment of all standards at the earliest feasible date. The <br /> intent of the long range plan is to identify actions necessary to <br /> 1- <br /> achieve attainment over a longer time frame, with the year 2000 selected <br /> as a target date. <br /> Existing Air Quality <br /> The South Coast Air Quality Management District measures air <br /> quality at their Anaheim Station, approximately seven miles north of the <br /> * Clean Air Act Amendments, 1977. <br /> 126