<i>The</i>Occurrence, Distribution,<i>and</i>Significance<i>of</i>Photochemical Air Pollution<i>in the United States, Canada, and Mexico</i>

Abstract

Some of the gross manifestations of photochemical air pollution are: reduction in visibility, eye irritation, cracking of rubber, elevated atmospheric oxidant levels, and damage to plants. All of these manifestations frequently occur simultaneously and all are associated with photochemical air pollution. The levels of ozone associated with the development of specific symptoms (e.g., eye irritation) are identified, and a map of areas in which photochemical plant damage have been identified in California is presented. Photographs of the kinds of plant damage caused in different species by ozone are presented. The relative contributions of the four principal sources of pollution in the Los Angeles area (industry, motor vehicles, incinerators, and heating) are graphed and discussed. 30 references, 11 figures.