Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Aerosol characteristics and visibility /
Author Waggoner, Alan P. ; Charlson., Robert J.
Other Authors
Author Title of a Work
Waggoner, Alan P.
Charlson, Robert J.
CORP Author Washington Univ., Seattle. Dept. of Civil Engineering.;Environmental Sciences Research Lab., Research Triangle Park, N.C.
Publisher Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1977
Report Number EPA/600/3-77/072; EPA-R-800665
Stock Number PB-269 944
OCLC Number 53236423
Subjects Aerosols. ; Atmospheric chemistry. ; Atmospheric transparency. ; Visibility.
Additional Subjects Aerosols ; Air pollution ; Visibility ; Particles ; Optical properties ; Light scattering ; Nephelometers ; Concentration(Composition) ; Particle size distribution ; Samplers ; Design criteria ; Performance evaluation ; Gas analysis ; Chemical analysis ; Atmospheric attenuation ; Atmospheric chemistry ; Air pollution detection
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB-269 944 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 36 pages : illustrations ; 28 cm.
This report summarizes progress in measuring the optical properties of aerosols and in relating aerosol characteristics to visibility reduction made in the author's laboratory during the period 1965-1971. An instrument, the integrating nephelometer, which measures the scattering component of extinction, b(sp), was developed and used in several field studies. Measured b(sp) and observer visibility have been shown to be highly correlated and to follow the Koschmieder relation. Measured b(sp) is highly correlated (0.95 in Los Angeles) with suspended particle volume in the 0.1 to 1.0 micrometer size range. A useful correlation (0.56 to 0.92 at various sites) has been found between b(sp) and particle mass as collected on a filter. Techniques have been developed to measure b(sp) as a function of relative humidity for ambient and model aerosols. Water, absorbed by hygroscopic aerosols, as H2SO4, and/or deliquescent aerosols, as (NH4)2SO4, make a substantial contribution to visibility reduction. Techniques were also developed to measure the absorption component of extinction, b(sp); to measure the forward/backward scattering ratio; and to determine b(sp) as a function of wavelength.
"EPA-600/3-77-072 " "July 1977." Includes bibliographical references (pages 33-35). Microfiche.