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Published June 20, 1983 | Published
Journal Article Open

Fogwater chemistry in an urban atmosphere


Analyses of fogwater collected by inertial impaction in the Los Angeles basin and the San Joaquin Valley indicated unusually high concentrations of major and minor ions. The dominant ions measured were NO_3^−, SO_4^(2−), NH_4^+, and H^+. Nitrate exceeded sulfate on an equivalent basis by a factor of 2.5 in the central and coastal regions of the Los Angeles basin but was approximately equal in the eastern Los Angeles basin and the San Joaquin Valley. Maximum observed values for NH_4^+, NO_3^−, and SO_4^(2−) were 10.0, 12.0, and 5.0, meq 1^(−1), while the lowest p;H observed was 2.2. Iron and lead concentrations of over 0.1 mM and 0.01 mM, respectively, were observed. High concentrations of chemical components in fog appeared to correlate well with the occurrence of smog events. Concentrations in fogwater were also affected by the physical processes of condensation and evaporation. Light, dissipating fogs routinely showed the highest concentrations.

Additional Information

© 1983 American Geophysical Union. Received October 4, 1982; revised February 4, 1983; accepted February 17, 1983. We gratefully acknowledge the financial support of the California Air Resources Board and the invaluable assistance provided by its professional staff. Additional logistical support was provided by the South Coast Air Quality Management District. Special thanks are extended to R. C. Flagan, J. J. Morgan, D. Lawson, and D. Grosjean for their contributions to the success of this research.

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