CALINECalifornia Line Source Model
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Thus, we expect that longer-term exposure estimates (monthly, trimester, and entire-pregnancy averages) derived from CALINE models closely reflect residential exposure to local traffic-generated pollutants because traffic counts and mixing heights are based on long-term, annual, or seasonal average observations.
Our exposure model is much cruder than mobile source air dispersion models such as Caltran's CALINE model, which also estimates dispersion of vehicle exhaust based on a Gaussian diffusion equation, but taking meteorologic factors, roadway geometry, and vehicle emission rates into account (Benson 1984).