Abstract
Ms part of a long-range study of natural levels of trace substances common to both polluted and unpolluted atmospheres, a series of measurements was undertaken in the coastal areas of California. The investigation was jointly supported by the Department of Public Health, State of California, the U. S. Weather Bureau, and the Public Health Service. Background oxidant levels, presumably caused by natural ozone, can have importance for a number of reasons: (1) they represent the lower limit attainable by air pollution control; (2) natural ozone may enter into reactions with, organic pollutants to form toxic end products, and (3) if these concentrations vary sufficiently with meteorological conditions, a pollution incident may well be intensified or moderated, depending on whether it coincides with a natural maximum or minimum, respectively. Hence it was deemed desirable to determine (1) the normal level of oxidant at remote Pacific Coastal sites, (2) the size and frequency of deviations from normal, and (3) the meteorological conditions concomitant with these deviations. It was also necessary to attempt to determine the trajectory of the air sampled, since little information was available on the persistence of oxidant from urban sources. The meteorological aspects of the problem are being reported separately.
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