Abstract
The impact of a potential increase in vehicular diesel emissions on atmospheric particle concentrations and size distributions in a large urban area (Chigago) is investigated numerically, for idealized meteorological conditions. Results indicate that the projected increase in diesel emissions would affect mainly the concentrations of particles with diameters smaller than 1 μm; larger particles would not be affected significantly. The particle concentrations in the accumulation mode (diameter near 0.2 μm) would be increased by about a factor of ten, while the concentration of particles of the Aitken nuclei mode (diameter near 0.02 μm) would be reduced significantly. The area in which the annual average air quality particulate standard is exceeded is quite small for the reference case based on emissions in 1983, but would increase to cover almost the entire urban area for the projected increase in diesel emissions in 2000.
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