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Characteristics of Summer Midday Low-Visibility Events in the Los Angeles Area

Larson, Susan M. and Cass, Glen R. (1989) Characteristics of Summer Midday Low-Visibility Events in the Los Angeles Area. Environmental Science and Technology, 23 (3). pp. 281-289. ISSN 0013-936X. doi:10.1021/es00180a003.

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A five-site air monitoring network provided data during the summer of 1984 on pollutants that contribute to the midday visibility problem in the Los Angeles area. The data were supplemented by visual range observations and by nephelometer measurements of total light scattering. The network collected data over an extended region, obtained a data set describing the frequency distribution of high- and low-visibility events over an extended time period, and obtained information needed to calculate the cause and effect relationship between pollutant properties and the extinction coefficient from theories of light scattering and absorption, rather than from statistical techniques. Computed scattering coefficient values at the Pasadena site are on average within 26% of the measured values. Frequency distributions of calculated extinction coefficients at Pasadena agree with the frequency distribution of extinction coefficients estimated from visual range values for all but the extreme extinction cases. These data can be used to investigate the effect that an emission control program would have on visibility in the Los Angeles area.

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Additional Information:© 1989 American Chemical Society. Received for review November 16, 1987. Revised manuscript received August 18, 1988. Accepted September 8, 1988. Support for this research was provided by the National Aeronautics and Space Administration, by a grant from the Hewlett Foundation, and by gifts to the Environmental Quality Laboratory. We thank Barbara Turpin for her assistance with filter handling and for her help during the field experiment8 and thank Kenneth McCue, Frank Vasquez, and Philip Lin for their help in preparing some of the graphs and statistical analyses in this work. Aerosol carbon analyses were performed under the direction of James Huntzicker of the Oregon Graduate Center, and John Cooper of NEA Inc. directed the X-ray fluorescence analysis of aerosol samples. The South Coast Air Quality Management District provided information on gaseous pollutant concentrations.
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Hewlett FoundationUNSPECIFIED
Environmental Quality LaboratoryUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20160629-142051760
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Official Citation:Characteristics of summer midday low-visibility events in the Los Angeles area Susan M. Larson and Glen R. Cass Environmental Science & Technology 1989 23 (3), 281-289 DOI: 10.1021/es00180a003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68764
Deposited By: Ruth Sustaita
Deposited On:29 Jun 2016 21:47
Last Modified:11 Nov 2021 04:04

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