Abstract
Results are presented of aerial measurements in plumes from large urban areas, petroleum refineries, automotive-painting operations, fossil-fuel power plants, and the controlled burning of forest slash. The field monitoring studies, which were carried out during the summer months between 1974 and 1980, emphasized the collection of data on in-plume ozone buildup and associated precursor concentrations. With the exception of power-plant emissions, photochemical ozone formation in excess of ambient background levels was documented in all the plumes studied. An examination of NMHC/NO/sub x/ suggests that ozone production (or, in the case of power-plant effluents, depletion) is consistent with the traditional HC-NO/sub x/-UV light model. The urban nonmethane hydrocarbon composition is found to be similar for the cities monitored, but marked variation is seen between the plumes from other sources.
Published Version
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