Abstract
During the period January 1972 to June 1975, monthly average atmospheric lead concentrations at five metropolitan Denver sampling sites displayed macima during winter months that coincided with minima in mixing heights. Monthly atmospheric lead inputs estimated on the basis of city-wide consumption of leaded gasoline showed a general downward trend with maxima during summer months. Atmospheric lead concentrations correlated well with the dispersion factor, the product of the mixing height and the mean wind speed. Monthly average atmospheric lead concentrations did not correlate with a simple linear proportion of monthly lead additive consumption, even when effects due to variability in the dispersion factor were statistically removed. Thus, the short-term variability in other parameters, including actual automotive lead emission factors and traffic patterns, masked the variability due to lead additive consumption during the study. However, this does not preclude the possibility that the linear rollback model may still apply to automotive lead over the long term of several years to decades. 32 references, tables.
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