uniformly in the central-eastern part of the U.S., with a peak in the Midwest. Yearly averaged population-weighted concentration of rail-attributable PM2.5 is 0.20 mg m3.
uniformly in the central-eastern part of the U.S., with a peak in theMidwest. Yearly averaged population-weighted concentration ofrail-attributable PM2.5 is 0.20 mg m3.