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The analysis begins by calculating the ambient concentration of PM10 attributed to <br /> industrial combustion. The contribution from industrial combustion makes up part of <br /> the"vegetative burning' category in the CMB modeling. The industrial component of <br /> this category has been estimated to be 30% based on the literature,including the EPA <br /> Criteria Document for PM1o. Because we are trying to determine the relative benefits of <br /> local emission reductions,the contribution from natural sources and transport from <br /> outside the region is subtracted from this result. The SJVAPCD estimates that these <br /> sources contribute 20% of the measured concentration. According to the rollback <br /> modeling,local sources within the smallest area of influence contribute 50% of the <br /> measured PM1o, after excluding transport and natural sources. The balance is <br /> contributed by regional and subregional sources. <br /> The emission inventory associated with the rollback analysis has been provided by the <br /> SJVAPCD in the PM10 plan. The inventory includes the local component(U), a broader <br /> local component (L2),the subregional component (Sr = County), and the regional <br /> component (R= San Joaquin Valley). The concentration calculated by the methodology <br /> described in the previous paragraph corresponds to the local component (M) of the <br /> emission inventory. <br /> The local impact is obtained by dividing local concentration by local emissions. <br /> The relative impact (SO2: PM10) is obtained by dividing the local impact for direct PM10 <br /> by the local impact for SO2. This relative impact is the interpollutant offset ratio. <br />