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RECORD NUMBER: 20 OF 28

OLS Field Name OLS Field Data
Main Title On the Proportionality of Fine Mass Concentration and Extinction Coefficient for Bimodal Size Distributions.
Author Lewis, Charles W. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1981
Report Number EPA-600/J-81-125;
Stock Number PB82-207770
Additional Subjects Light transmission ; Aerosols ; Particle size ; Light scattering ; Concentration(Composition) ; Arid land ; Visibility ; Air pollution ; Reprints ; Air quality ; Extinction coefficients ; Atmospheric transmissivity
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB82-207770 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 10p
Abstract For a bimodal size distribution of ambient aerosol, an upper limit in particle size can be chosen for the fine aerosol fraction so that the extinction coefficient for light scattering and absorption is directly proportional to the fine mass concentration, with no dependence on the coarse mass concentration. With the size parameters of the modes taken to be 'grand average continental' values of Whitby, the upper size limit is 3.4 micrometers (aerodynamic diameter). Consequently, the extinction coefficient could be inferred from a measurement of the fine mass concentration only, even in arid regions where coarse aerosol concentrations usually far exceed the fine.
Supplementary Notes Pub. in Atmospheric Environment, v15 n12 p2639-2646 1981.
NTIS Title Notes Journal article.
Title Annotations Reprint: On the Proportionality of Fine Mass Concentration and Extinction Coefficient for Bimodal Size Distributions.
PUB Date Free Form 1981
Category Codes 4A; 55E; 68A
NTIS Prices PC A02/MF A01
Primary Description 600/09
Document Type NT
Cataloging Source NTIS/MT
Control Number 323815216
Origin NTIS
Type CAT