. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Significance of "Natural" Smog Organic hydrocarbons (such as mono- terpenes and isoprene) that are emitted from trees, brush, and other vegetation are the forerunners of "natural" smog. To determine the significance of these emissions in the Los Angeles Basin, scienists from the Pacific Southwest Station, the Statewide Air Pollution Research Center, and the University of California, Riverside, determined vegetation composition and measured the hydrocarbons emi
. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Significance of "Natural" Smog Organic hydrocarbons (such as mono- terpenes and isoprene) that are emitted from trees, brush, and other vegetation are the forerunners of "natural" smog. To determine the significance of these emissions in the Los Angeles Basin, scienists from the Pacific Southwest Station, the Statewide Air Pollution Research Center, and the University of California, Riverside, determined vegetation composition and measured the hydrocarbons emitted from this vegetation. They found native and urban plant species to be minor sources of reactive organic hydrocarbons while human sources were major. No more than 10 percent (and probably much less) of the photochemicaily formed ozone in the Los Angeles Basin can be traced to emissions from foliage. Below the 3,600-foot level, native veg- etation covered 33 percent of the land area in the Los Angeles Basin. The estimate for the upper limit of emis- sions from native vegetation in the summer was 52 tons per day; an addi- tional 41 tons per day were estimated for urban vegetation. Tnis information was generated by a multiagency, multidisciplinary research team funded by the California Air Re- sources Board, and the results were made available immediately to State and local pollution control At most, 10 percent of the photochemicaily formed ozone recorded on this instrument results from hydro- carbons given off by trees and plants. 26. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Forest Service. [Washington, D. C. ?] : USDA, Forest Service
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