Atmospheric Sulfur and Nitrogen Oxides. Eastern North by George M. Hidy

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By George M. Hidy

Atmospheric Sulfur and Nitrogen Oxides offers a radical synthesis of the study on atmospheric sulfur and nitrogen oxide chemistry on geographically huge scales, with distinct emphasis at the tools and problems of creating source-receptor relationships. The booklet addresses the significance of long-range air delivery, the function of ozone and oxidant chemistry, and it examines analytical equipment and pollutant shipping versions. this article in particular covers

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However, most of the NO* and N03~ are found in the gas phase, at the 90th percentile. At this extreme, particle concentrations excluding NH4HSO4 and NH4NO3 are smaller in relative concentration than at the median level. 8. 4%). 8 gives the distribution of the major constituents in the S and N chemistry. The ambient concentration levels reported in the SURE are similar to those of the EMEFS. However, in the latter case the median levels (90th percentile) of S0 2 , SO4, NO*, and HN0 3 are generally lower but 0 3 levels are reported to be higher for this network.

N 2 0 is considered reactive in the lower atmosphere. Natural production of SOx and NO* species is estimated generally to be small relative to anthropogenic sources in ENA. They are larger in summer than in winter. NAPAP (1990a) reviews natural sources over ENA. Natural HCs or VOCs are emitted from both terrestrial and marine sources. Most reactive are terpene compounds from trees and brush. Biogenic methane (CH4) is by far the most prevalent natural hydrocarbon species in the air, but is far less reactive than other components.

C Marine sites. d Continental sites. e Data from California Air Resources Board, 1991. 27 3. CHARACTERIZATION OF REGIONAL AIR AND DEPOSITION CHEMISTRY 48 μπιοΙ/L. The coastal California site compares well with the remote sites elsewhere. The rural mountain location in the Sierra Nevada is also similar. 4. Inspection of the concentration data suggests similar H + concentrations between continental locations, as in the case of Na + , Mg2+, and Cl". However, concentrations of other ions such as Ca2+ and NH4 are higher in Colorado than the remote sites.

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