Record Display for the EPA National Library Catalog


Main Title Trace Chemical in the 'Clean' Troposphere.
Author Singh, H. B. ; Salas, L. J. ; Stiles, R. ;
CORP Author SRI International, Menlo Park, CA.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1981
Report Number EPA-R-806729; EPA-600/3-81-055;
Stock Number PB82-249202
Additional Subjects Air pollution ; Trace elements ; Troposphere ; Fluorine organic compounds ; Chlorine organic compounds ; Bromine organic compounds ; Iodine organic compounds ; Concentration(Composition) ; Trends ; Halogen organic compounds ; Chloromethanes ; Point Arena(California) ; Ethane/dichloro ; Ethylene/tetrachloro ; Ethylene/trichloro
Library Call Number Additional Info Location Last
NTIS  PB82-249202 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 57p
Atmospheric measurements at Point Arena, California (39 N) are used to assess the burden as well as the growth rates of a large number of important atmospheric trace chemicals. In early 1981 the organic fluorine, chlorine, bromine, and iodine burden of the northern hemisphere (midlatitudes) was determined to be 1.3 parts per billion (ppb), 3.7 ppb, 0.02 ppb, and less than 0.003 ppb respectively. An increase of approximately 25 percent in the atmospheric burden of fluorine and chlorine appears to have occurred over the last three years. The dominant natural halocarbon, methyl chloride, does not appear to show any detectable trends. Among the important man-made chemicals such as methylene chloride, 1,2 dichloroethane, tetrachloroethylene, and trichloroethylene, slightly declining trends or change is evident.