Ozone Formation in Photochemical bxidation of Organic Substances.
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1484
A. J. Haagen-Smit and M. M. Fox
Photochemical Oxidation of Hydrocarbons..
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1488
Formation of Ozone in Los Angeles Atmosphere.
1492
Harold S. Johnston
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F. E. Littman, H. W. Ford and N. Endow
Reactions of Nitrogen Dioxide and Organic Compounds in Air
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1498
Edgar R. Stephens, Philip L. Hanst, Robert C. Doerr and William E. Scott
Photochemical Oxidation of Biacetyl b y Molecular Oxygen
1505
R. P. Taylor and F. E. Blacet
Effects of Present-Day Fuels on Air Pollution.
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1508
Paul Mader, M. W. Heddon, M. G. Eye and W. J. Hamming
Scavenging Action of Rain on Air-borne Particulate Matter
1512
C. Roland McCully, Morris Fisher, Gerhard Langer, Jan Rosinski, Harvey Glaess and Don Werle
Sulfur Dioxide in New York City Atmosphere.
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Leonard Greenburg and Morris B. Jacobs
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1517
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CHEMISTRY OF POLLUTANTS
IN THE ATMOSPHERE
T h e primar)- purpose of this symposium is to discuss the chemical reactions of the different types of pollutants in the atmosphere. Earlier studies in urban areas have generally been concerned \vith coal smoke and the accompank-ing sulfur dioxide ivhich confers reducing properties on the air mass. l f o r e recently the strongly oxidizing atmosphere of the Los .\ngeles basin has been studied. Here complex photochemical reactions produce lachrymatory and phytotoxic compounds froin innocuous precursors such as hydrocarbons and the oxides of nitrogen. Perhaps inevitably. there have been differences of opinion among the investigators as to the details of these reactions. It is gratifying to note that with additional information. these differences havr been resolved and general agreement has been reached. though much more \vork remains to be done. The brilliant theoretical analysis and sound experimental evidence by Haagen-Smit and associates on the Los .\ngeles smog has been confirmed and extended by the Stanford Research Institute group ~ v h o studied the smog precursors; by the Franklin Institute group who applied the new 460-meter-path infrared cell to these reactions; by Johnston who discussed possible free radical concentrations in natural smog: and by Taylor and Blacet who investigated the photochemical oxidation of biacetyl. By contrast. conditions in New York are shown by Greenburg and Jacobs to he essential]>. different: though the occurrence of the Los Angeles-type smog in New York and other cities is experienced occasionally.
H. F. Johnstone L. C. McCabe M. D. Thomas O n e of the papers of this symposium, .'Polynuclear Aromatic Hvdrocarbonr in the Atmosphere." b y Violet C . Shore'and Siorris Kat2 is published i n .4nai. Chrm. 28, 1319 !1956'.
VOL. 48, NO. 9
SEPTEMBER 1956
1483
