Abstract
The American Petroleum Institute sponsored a research project to investigate the problem of air pollution in urban areas. This was a long-range basic study designed to find out just what chemicals go into the air and what happens to them after they become a part of the environment and how these facts relate to air pollution. The nature of chemicals identified indicated that a major source of urban air pollution might be the exhaust gases from motor vehicles. This conclusion was supported by a number of general observations, such as formation of smog clouds over main arteries of traffic in the Los Angeles basin. Industrial plants contribute to air pollution as well as the activities from human beings. It was proven that sulfur dioxide being oxidized to sulfur trioxide in the air made only an insignificant contribution to the smog phenomenon. It was also proven that the high ozone content typical of Los Angeles smog is not characteristic of other localities. The sulfur dioxide content of Los Angeles air was found to be much lower than that of the other cities studies.
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