Record Display for the EPA National Library Catalog


Main Title Meteorological and Site Influences Affecting the Comparison of Nephelometer and Photographic Determinations of Light Extinction at Rural Sites in the Eastern United States.
Author Evans, E. G. ; Tropp, R. J. ; Fitz-Simons, T. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Alliance Technologies Corp., Chapel Hill, NC.
Publisher 1992
Year Published 1992
Report Number EPA/600/A-92/139;
Stock Number PB92-195999
Additional Subjects Haze detection ; Extinction ; Air pollution monitoring ; Fines ; Light transmission ; Atmospheric optics ; Nephelometers ; Photography ; Rural areas ; Eastern region(United States)
Library Call Number Additional Info Location Last
NTIS  PB92-195999 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 19p
The level of agreement and the degree of linear correlation between nephelometer and photographic determinations of light extinction were examined from data obtained as part of the Eastern Fine Particle and Visibility Network (EFPVN). Information about the relative equivalence of the two methods was used (along with site-specific topographic features and meteorological factors affecting slide codes and visual range determinations) to assess the significance of various sources of inaccuracy affecting each method. For the EFPVN measurements, significant seasonal and inter-site variation were found in both the level of agreement between seasonal averages and the degree of correlation between short-term (hour to daily) nephelometer and photographic measurements. These differences are examined in terms of seasonal changes, intersite differences, and coding and treatment of photographic measurements for meteorological conditions.