Abstract
In the present study, we performed a top-down validation of the reactive organic gas and carbon monoxide emission inventories for California's South Coast Air Basin by comparing speciation profiles for nonmethane organic gases (NMOG) and ratios of CO/NOx and NMOG/NOx derived from early-morning (0700 to 0800) ambient measurements taken during the 1987 Southern California Air Quality Study with the corresponding ratios and speciation profiles derived from day-specific, hourly, gridded emission inventories. We considered twenty separate comparisons for each ratio, each representing a different combination of season, emission category, and spatial and temporal averaging of emissions. We determined that the most appropriate comparison in summer was ambient pollutant ratios with ratios derived from morning on-road motor vehicle emission inventories, and in the fall, ambient ratios with ratios derived from overnight on-road motor vehicle emission inventories with some contribution from overnight stationary-sou...
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