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Science 12 November 1982:
Vol. 218. no. 4573, pp. 677 - 680
DOI: 10.1126/science.218.4573.677
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Articles

Chemical Composition of Acid Fog

JED M. WALDMAN 1, J. WILLIAM MUNGER 1, DANIEL J. JACOB 1, RICHARD C. FLAGAN 1, JAMES J. MORGAN 1, and MICHAEL R. HOFFMANN 1

1 Environmental Engineering Science, W. M. Keck Laboratories, California Institute of Technology, Pasadena 91125

Fog water collected at three sites in Los Angeles and Bakersfield, California, was found to have higher acidity and higher concentrations of sulfate, nitrate, and ammonium than previously observed in atmospheric water droplets. The pH of the fog water was in the range of 2.2 to 4.0. The dominant processes controlling the fog water chemistry appear to be the condensation and evaporation of water vapor on preexisting aerosol and the scavenging of gas-phase nitric acid.

Submitted on March 15, 1982
Revised on May 10, 1982


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