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By C. Shepherd Burton, Mei-Kao Liu, Philip M. Roth, Christian Seigneur, Gary Z. Whitten (auth.), C. De Wispelaere (eds.)

In 1969 the North Atlantic Treaty association verified the Committee at the demanding situations of Hodern Society. pollution used to be from the beginning one of many precedence difficulties below research in the framework of the pilot reports undertaken through this Committee. The association of a each year symposium facing pollution modeling and its program is without doubt one of the major actions in the pilot learn on the subject of pollution. After being equipped for 5 years by way of the U.S. and for 5 years through the Federal Republic of Germany, Belgium, repre­ sented by means of the leading Minister's place of work for technology coverage Programming, grew to become dependable in 1980 for the association of this symposium. This quantity comprises the papers provided on the twelfth Interna­ tional Technical assembly on pollution Modeling and its Appli­ cation held at SRI foreign, Menlo Park, California within the united states from twenty fifth to twenty eighth August 1981. The assembly was once together equipped by way of the top Minister's place of work for technological know-how coverage Programming, Belgium and SRI overseas, united states. The convention used to be attended via 109 contributors and fifty one papers were offered. The individuals of the choice committee of the twelfth I.T.M. have been A. Berger (Chair­ guy, Belgium), W. Klug (Federal Republic of Germany), L.E. Niemeyer (United States of America), L. Santomauro (Italy), J. Tikvart (United States of America), M.L. Williams (United Kingdom), H. Van Dop (The Netherlands), C. De Wispelaere (Coordinator, Belgium).

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BURTON ET AL. Demerjian, K. , Kerr, J. , and Calvert, J. G. (1974), "The Mechanism of Photochemical Smog Formation", in Advances in Environmental Science and Technology, J. N. Pitts, Jr. and R. L. Metcalf, eds. (John Wiley & Sons, New York, New York). Donaldson, C. DuP. S. C. Donaldson, C. , and Hilst, G. R. (1972), "Effect of Inhomogeneous Mixing on Atmospheric Photochemical Reactions", Environ. Res. , Vol. 9, pp. 812-816.

1980a). Their value of 2 x 10-6 ppm- l min- l corresponded to a loss rate of N02 to nitric acid of about 30 percent per hour. , 1981). A possibly important consequence of Reactions 6, 8, and 9 is that in urban areas, although nitric acid formation near the surface essentially ceases, it can continue aloft. Nitric acid formation ceases at the surface during periods of darkness for two reasons : the rate of Reaction 7 becomes zero in the absence of sunlight; the rate of C. S. BURTON ET AL. 24 Reaction 6 becomes extremely slow or zero because during the evening period Reaction 2 consumes all of the available 03' However, above the ground, Reaction 6 can continue during the evening hours because there is a continuous source of ozone from the air outside the plume that can be entrained into the expanding plume.

In urban areas, interest is extended to organic nitrates. Field studies of plumes are needed that are directed at obtaining nitrogen balances in urban and rural atmospheres under both moist and dry conditions and during both daytime and nighttime. Such programs should pursue obtaining observations of NH3, N03' HN03, N205 and (if at all possible) HONO, in addition to N02, 03 and hydrocarbons. Particulate nitrate measurements are also necessary. Plume (or at least surface) measurements of OH and H202 should be made as well.

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