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e <br />u <br />r <br />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 Quality 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 />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 />0 <br />75D-2Yb <br />