Role of Nitrogenous Pollutants in the Formation of Atmospheric Mutagens and Acid Deposition

摘要

Three field studies were conducted in the California South Coast Air Basin to provide information concerning the relative importance of atmospheric transformations and sampling artifacts in determining the mutagenic burden in California's atmospheres, and generate in-situ, quantitative, and interference-free measurements of the ambient concentrations of HONO, NO2, HNO3, NH3, and NO3 radicals (as well as HCHO) which could serve as benchmark data for comparison with other less specific analytical methods participating in the CARB-sponsored Nitrogen Species Measurement Method and Carbonaceous species methods Comparison Studies. The major findings were that in the South Coast Air Basin a significant portion of ambient particulate mutagenicity can be accounted for by a relatively few highly mutagenic nitroarenes which are largely atmospheric reaction products, rather than directly-emitted species.