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)
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB-196 825 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
92p |
Abstract |
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) |