The Distribution of Contaminants in the Los Angeles Basin Resulting from Atmospheric Reactions and Transport

Mosher, John C.; MacBeth, William G.; Leonard, Myron; Mullins, Tina; Brunelle, M. F.

doi:10.1080/00022470.1970.10469372

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…Since any study involving air contaminants must first consider the principal sources and source areas, the morning hours at central Los Angeles were chosen to demonstrate the buildup of hydrocarbons due to the influx of motor vehicles into the area at that time. 3…”

Section: Discussionmentioning

confidence: 99%

Effects of the Motor Vehicle Control Program On Hydrocarbon Concentrations in The Central Los Angeles Atmosphere

Leonard

Fisher

Brunelle

et al. 1976

Journal of the Air Pollution Control Association

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The body of information presented in this paper is directed to those individuals concerned with the effect of the motor vehicle control program on ambient hydrocarbon concentrations in a metropolitan area during peak traffic hours. The data used in this study are from gas chromatographic analyses of air samples taken in 1963-65, before implementation of the exhaust control program for new motor vehicles, and in 1971 and 1973, after several years' application of this program. A brief history of the motor vehicle program in California together with emission standards for hydrocarbons are discussed and certain automobile-related hydrocarbons are identified and characterized. Frequency distributions were constructed for total hydrocarbons, non-methane hydrocarbons, methane, acetylene, and isopentane for 1963-65, 1971, and 1973 and the standard deviation (1 sigma) concentration limits are discussed for each of the subgroups mentioned above. The average concentration and relative percent comparisons for methane, ethane, n-butane, isopentane, C 3+ paraffin, ethene, propene, C 4+ olefin, acetylene, benzene, and toluene are shown and discussed in detail. These studies: 1) show hydrocarbon emissions from motor vehicles were reduced 47.6% during this time period; 2) indicate selective reduction of compounds; and 3) reveal a 51.8% reduction in the 1973 ambient total hydrocarbon concentration since 1963-65.

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Section: Discussionmentioning

confidence: 99%

Effects of the Motor Vehicle Control Program On Hydrocarbon Concentrations in The Central Los Angeles Atmosphere

Leonard

Fisher

Brunelle

et al. 1976

Journal of the Air Pollution Control Association

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“…by Coffin and co-workers, showing a progressiVe impairment of phagocytic function in pulmonary macrophages from mice exposed for three hours to concentrations of ozone between 0.3 and 4.0 ppm.16 It should also be noted that these findings may have clinical relevance since exposures of this magnitude occur in urban settings. 17 Since silicosis failed to enhance this ozone-induced defect, it appears that in this setting anatomic damage does not compromise pulmonary antibacterial defenses. It would appear that the enhanced susceptibility to atmospheric pollutants which occurs in individuals with chronic respiratory diseases is due primarily to the presence of infection, and that the anatomic damage which is present is of lesser importance.…”

Section: Commentmentioning

confidence: 98%

Influence of Ozone on Pulmonary Defense Mechanisms of Silicotic Mice

Goldstein

1972

Archives of Environmental Health: An International Journal

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“…According to Tabershaw et al (8), the highest concentration of NO2 recorded in the Los Angeles area in 1964 was 1.3 ppm, and during the same year hourly averages of NO2 exceeded 0.25 ppm about 9% of the days. Over a 3-year period from 1966 to 1968 the daily maxima of 0.3 ppm of NO2 were exceeded on 10% of the days in the same area (7).…”

mentioning

confidence: 98%

Effect of NO2 on Airborne Venezuelan Equine Encephalomyelitis Virus

Ehrlich¹,

Miller²

1972

Applied Microbiology

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Studies were conducted to determine the effect of nitrogen dioxide (NO2) on aerosol survival and biological decay rate of Venezuelan equine encephalomyelitis (VEE) virus and spores of Bacillus subtilis var. niger. The NO2 concentrations used in the experiments were 0.5, 5, and 10 ppm at 24 C and 85% RH. The survival of airborne VEE virus disseminated as particles 1 to 5 um in diameter was significantly influenced by the presence of 5 ppm of NO2. At this concentration, the biological decay rate increased threefold and the aerosol recovery and aerosol survival of the VEE virus were significantly lower than at 0.5 ppm or in the absence of NO2. Airborne spores of B. subtilis were not significantly affected by as much as 10 ppm of NO2.

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The Distribution of Contaminants in the Los Angeles Basin Resulting from Atmospheric Reactions and Transport

Cited by 13 publications

References 3 publications

Effects of the Motor Vehicle Control Program On Hydrocarbon Concentrations in The Central Los Angeles Atmosphere

Effects of the Motor Vehicle Control Program On Hydrocarbon Concentrations in The Central Los Angeles Atmosphere

Influence of Ozone on Pulmonary Defense Mechanisms of Silicotic Mice

Effect of NO2 on Airborne Venezuelan Equine Encephalomyelitis Virus

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