Record Display for the EPA National Library Catalog


Main Title Analysis of Los Angeles Atmospheric Reaction Data from 1968 and 1969.
Author Eschenroede, A. Q. ; Martine, J. R. ;
CORP Author General Research Corp., Santa Barbara, Calif.
Year Published 1970
Report Number GRC-CR-1-170; APRAC-CAPA-7-68; 7-68;
Stock Number PB-196 825
Additional Subjects ( Air pollution ; Smog) ; ( Urban areas ; Air pollution) ; ( Nitrogen oxides ; Air pollution) ; ( Hydrocarbons ; Air pollution) ; Meteorological data ; Concentration(Composition) ; Photochemistry ; Ozone ; Nitrogen oxide(NO) ; California ; Nitrogen dioxide ; Sampling ; Diurnal variations ; Alkenes ; Oxidizers ; Los Angeles(California)
Library Call Number Additional Info Location Last
NTIS  PB-196 825 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 92p
Analysis of air pollution data from the Los Angeles basin program identifies some of the significant photochemical aspects of the control problem. Data processing of the detailed gas chromatograph measurements provides distributions of hydrocarbons among reactivity classes. Mole-weighted averages place the hydrocarbon mixture between ethylene and 1-alkenes on a biological-effects response scale. Upper bound curves for peak hourly oxidant show that somewhat more stringent control would be needed for oxides of nitrogen (NOx) than for nonmethane hydrocarbon (NMHC) to achieve a given oxidant standard. Ratios of NMHC to NOx less than unity appear to avoid optimum oxidant production. Further analysis shows that the emission source proportions of NOx to inerts (such as CO and C2H2) are not reflected in morning air samples on high oxidant days. Texts employing the 1969 data indicate a breakdown of the quasi-equilibrium assumption for the NO/NO2/03 cycle as ozone concentration departs from zero. For ozone concentrations less than 0.1 ppm, the two sides of the quasi-equilibrium equation lie within a factor of three of one another. The helicopter and tetroon results are likely to prove useful as validation benchmarks for mathematical modeling studies. (Author)