For example, the relative disparity in exposure (i.e., relative to the overall population average) for on-road mobile source PM2.5 is more than three times as large for AB617 communities as for the most-exposed racial-ethnic group, increasing somewhat from 40% (year-2000) to 45% (year-2019). Stratifying by CalEnviroScreen score (which is used in part to identify SB535 communities), we find even larger relative disparities (Fig. ).