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Total tons / day of particulate matter exhaust emissions 20.0 20.7

" From California Air Resources Board "Motor Vehicle Inventory MVE17G Corrected" (1996); in Methodology for Estimating Emissions from On-Road Motor Vehicles, Vol. 1, Introduction and Overview (1996).

6 Also known as the Los Angeles Air Basin or southern California Air Basin.

'' PM = particulate matter.

' Two classes of on-road motor vehicles, light- and medium-duty trucks, that had relatively lower tons/day of exhaust emissions of PM are omitted for clarity. The three categories of light-duty trucks, noncatalyst, catalyst, and diesel, emitted a total of 1.43 and 0.99 tons/day of POM in 1982 and 1993, respectively. PM exhaust emissions totaled 0.04 and 0.05 tons/day in 1982 and 1993, respectively, for catalyst and noncatalyst, gasoline-fueled medium-duty trucks.

the world (Atkinson and Arey, 1994; Ciccioli et al., 1996; Arey, 1998a; see Section F).

Finally, from the "exposure" aspects of a health risk assessment of ambient POM, recall that the data for concentrations of PAHs and PACs in the composite whole sample are basinwide annual averages for 1993. The actual short-term (and probably annual) averages of concentrations of human cell mutagens at each of the four urban sampling sites located many kilometers apart (Fig. 10.23) can be significantly different. For

TABLE 10.28 Usage and Exhaust Emissions of Particulate Matter (PM) for Light-Duty Automobiles in California's

South Air Basinb in 1982 and 1993"

TABLE 10.28 Usage and Exhaust Emissions of Particulate Matter (PM) for Light-Duty Automobiles in California's

South Air Basinb in 1982 and 1993"

Percentage of

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