Record Display for the EPA National Library Catalog

RECORD NUMBER: 589 OF 799

OLS Field Name OLS Field Data
Main Title Optical Studies of Automotive and Natural Hazes: Scattering from Single Particles.
Author Phillip, David T. ; Wyat, Philip J. ;
CORP Author Science Spectrum, Santa Barbara, Calif.
Year Published 1971
Report Number EPA-APCO-CPA-70-171; APRAC-CAPA-6-68; 6-68-2;
Stock Number PB-202 361
Additional Subjects ( Air pollution ; Haze) ; ( Smog ; Light scattering) ; ( Exhaust gases ; Air pollution) ; ( Trees(Plants) ; Air pollution) ; Aerosols ; Particles ; Pine trees ; Automobile engines ; Gasoline ; Refractivity ; Photometers ; Air pollution detection ; Automobile exhaust
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-202 361 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 47p
Abstract
The objective of the study was to determine the feasibility of using measurements of the angular variation of the intensity of light scattered from single particles in the problem of identifying haze or aerosol particles originating from auto exhaust emissions. Scattering measurements were to be on single smog particles during a period of haze in Los Angeles. Analysis of scattering curves for larger laboratory aerosol particles shows measurable differences in refractive index between a photochemical pine tree aerosol and a photochemical petroleum aerosol. For particles of diameter less than 500 nanometers only the measurement of absolute scattering intensity at two angeles is required. Distinctive non-spherical and absorbing particles were observed both in automotive exhaust and atmospheric samples. Field measurements of single particle light scattering were carried out in Los Angeles and Santa Barbara.