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Effect of projected 2013–2025 reductions in US anthropogenic emissions on the formation of isoprene secondary organic aerosol (SOA). Emissions of NOx and SO2 are projected to decrease by 34% and 48%, respectively. Panels show the resulting percentage changes in the branching of ISOPO2 between the NO and HO2 oxidation channels, sulfate mass concentration, aerosol [H+] concentration, and isoprene SOA mass concentration. Values are summer means for the Southeast US boundary layer.
