Carbonyls in Los Angeles air: Contribution of direct emissions and photochemistry

Grosjean, Daniel; Swanson, Robert D.; Ellis, Carol

doi:10.1016/0048-9697(83)90034-7

Cited by 58 publications

(34 citation statements)

References 11 publications

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“…On the other hand, at almost most every monitoring location, concentrations of acetone decreased as temperature increased because of the photochemical reactions that consume (not produce) acetone as was investigated by several studies (Cox et al, 1980;Grosjean et al, 1983;Seinfeld, 1986). This also was consistent with the relatively higher concentrations of acetone in Vermont than other locations.…”

Section: Halogenated Hydrocarbonssupporting

confidence: 70%

“…This suggests that emissions from motor vehicles probably affect ambient levels of these compounds, and other factors also strongly influence ambient air of their concentrations. Grosjean et al (1983) estimated that photochemical reactions can contribute as much as 85% of the ambient formaldehyde and 95% of the ambient acetaldehyde levels in Los Angeles.…”

Section: Motor Vehicle Emissionsmentioning

confidence: 99%

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Volatile organic compounds in some urban locations in United States

2002

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Importance of this paper: Air pollution in urban locations contains many components that originate from a wide range of industrial, motor vehicle, and natural emissions sources. Some of these components include compounds known or suspected to be carcinogenic, and some of them play important roles in atmospheric chemistry such as tropospheric ozone pollution and stratospheric ozone depletion. Therefore, it is essential to characterize the composition, magnitude, and the distribution of urban air pollution through extensive ambient air monitoring and assess the impact of these components on human health and global atmospheric chemistry. AbstractVolatile organic compounds (VOCs) have been determined to be human risk factors in urban environments, as well as primary contributors to the formation of photochemical oxidants. Ambient air quality measurements of 54 VOCs including hydrocarbons, halogenated hydrocarbons and carbonyls were conducted in or near 13 urban locations in the United States during September 1996 to August 1997. Air samples were collected and analyzed in accordance with US Environmental Protection Agency-approved methods. The target compounds most commonly found were benzene, toluene, xylene and ethylbenzene. These aromatic compounds were highly correlated and proportionally related in a manner suggesting that the primary contributors were mobile sources in all the urban locations studied. Concentrations of total hydrocarbons ranged between 1.39 and 11.93 parts per billion, by volume (ppbv). Ambient air levels of halogenated hydrocarbons appeared to exhibit unique spatial variations, and no single factor seemed to explain trends for this group of compounds. The highest halogenated hydrocarbon concentrations ranged from 0.24 ppbv for methylene chloride to 1.22 ppbv for chloromethane. At participating urban locations for the year of data considered, levels of carbonyls were higher than the level of the other organic compound groups, suggesting that emissions from motor vehicles and photochemical reactions strongly influence ambient air concentrations of carbonyls. Of the most prevalent carbonyls, formaldehyde and acetaldehyde were the dominant compounds, ranging from 1.5-7.4 ppbv for formaldehyde, to 0.8-2.7 ppbv for acetaldehyde. Ó

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Section: Halogenated Hydrocarbonssupporting

confidence: 70%

Section: Motor Vehicle Emissionsmentioning

confidence: 99%

Volatile organic compounds in some urban locations in United States

2002

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“…Within the accuracy limits of the analytical technique no systematic differences can be seen. These HCHO measurements are also consistent with those made previously in the Los Angeles basin (Tuazon et al, 1981;Grosjean, 1982;Grosjean et al, 1983). The maximum concentrations measured at Citrus College appear to be slightly lower than those measured previously.…”

Section: August 1986supporting

confidence: 81%

Measurements of Hydrogen Peroxide and Formaldehyde in Glendora, California

Kok¹,

Walega²,

Heikes³

et al. 1990

Aerosol Science and Technology

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“…For these pollutants, in situ production via photo-oxidation of other VOCs has been reported to account for the majority of total ambient concentrations. 17 Also, production of these two pollutants is primarily driven by solar radiation and corresponding hydroxyl radical concentrations, which peak at midday. Mixing heights increase during the day, which dilute concentrations, so production of these two pollutants must be faster during the day to account for the higher daytime concentrations.…”

Section: Temporal Variability On Regional/nationalmentioning

confidence: 99%

Spatial and Temporal Variability of Ambient Air Toxics Data

Touma

Tikvart

2006

Journal of the Air & Waste Management Association

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This paper summarizes information on the spatial and temporal variability of selected air toxics pollutants collected on a national basis primarily for a period encompassing 1990 -2003. Spatial information on pollutant concentrations is characterized in terms of within-city and between-city variability. Temporal information is summarized as diurnal and seasonal variability and in multiyear trends. The information on variability is presented in the framework of a larger need for systematic documentation of information on air toxics pollutants to assess progress in air pollution control programs.

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Carbonyls in Los Angeles air: Contribution of direct emissions and photochemistry

Cited by 58 publications

References 11 publications

Volatile organic compounds in some urban locations in United States

Volatile organic compounds in some urban locations in United States

Measurements of Hydrogen Peroxide and Formaldehyde in Glendora, California

Spatial and Temporal Variability of Ambient Air Toxics Data

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