Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Evaluation of trained visible emission observers for fugitive emission opacity measurement /
Author Rose, Thomas H.
CORP Author Eastern Technical Associates, Raleigh, NC.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher GPO,
Year Published 1984
Report Number EPA-600/3-84-093; EPA-68-02-3480
Stock Number PB85-115152
OCLC Number 48068241
Subjects Air--Pollution--Measurement. ; Smoke plumes--Environmental aspects.
Additional Subjects Opacity ; Visibility ; Air pollution ; Plumes ; Smoke ; Fugitive emissions
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ESAM  EPA 600-3-84-093 Region 10 Library/Seattle,WA 10/29/2004
NTIS  PB85-115152 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 26 pages : illustrations ; 28 cm
A smoke generator was modified to emit white or black smoke in a horizontal direction near ground-level to simulate fugitive emissions. Observers were placed at a slightly higher elevation than the smoke generator and were then shown smoke plumes at four different opacity values against a dark terrestrial background. They read the opacities of the smoke and recorded their observations. The observers also evaluated smoke plumes from a conventional vertical emitting smoke generator under the same clear sky lighting conditions to determine that the observers had no bias when viewing normal plumes. For the white smoke, the observer's opacity readings of the simulated fugitive emission plumes were not significantly different than the opacity readings of the conventional plumes for opacities around 15-20%. Above 20% opacity, the observer readings of the white fugitive plumes become increasingly lower than the vertical plume readings. At 40% opacity, they were lower on average by about 8% opacity. For the black smoke, the observer readings of the simulated fugitive plumes were lower at all opacity levels. At 15% opacity, they were on average lower by about 5% opacity, and at 40% opacity, they were lower by about 11% opacity. For both white and black simulated fugitive emission plumes, the observers sensitivity to changes in opacity levels declined relative to the conventional verticle stack plumes.
Caption title. Final Report 1 Oct 80-1 Oct 81. "Oct. 1984." "EPA-600/3-84-093." Microfiche.