Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title User's Manual for the APRAC-1A Urban Diffusion Model Computer Program.
Author Mancus, R. L. ; Ludwi, F. L. ;
CORP Author Stanford Research Inst., Menlo Park, Calif.
Year Published 1972
Report Number CAPA-3-68(1-69)-CRC; APRAC-CAPA-3-68 ;SRI-8563; 3-4;
Stock Number PB-213 091
Additional Subjects ( Urban areas ; Air pollution) ; ( Air pollution ; Atmospheric motion) ; ( Highway transportation ; Air pollution) ; ( Computer programs ; Programming manuals) ; Handbooks ; Atmospheric diffusion ; Mathematical models ; Wind(Meteorology) ; Exhaust gases ; Carbon monoxide ; Streets ; Concentration(Composition) ; FORTRAN ; Automobile exhaust ; CDC 6400 computers ; APRAC 1A computer program ; IBM 360/50 computers ; Computerized simulation
Library Call Number Additional Info Location Last
NTIS  PB-213 091 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 122p
The APRAC-1A diffusion model was developed as a versatile and practical model for computing the concentrations of pollutants at any point within a city. The model calculates pollutant contributions from diffusion on various scales, including: extraurban diffusion, mainly from sources in upwind cities; intraurban diffusion from freeway, arterial, and feeder street sources; local diffusion of emissions within a street canyon. The model treats only carbon monoxide (CO), a relatively inert gas in the atmosphere but an important pollutant in terms of health. Motor vehicles are the major source of this gas. (Author)