Record Display for the EPA National Library Catalog

RECORD NUMBER: 580 OF 1744

OLS Field Name OLS Field Data
Main Title Evaluation of the APRAC-1A Urban Diffusion Model for Carbon Monoxide.
Author Ludwi, F. L. ; Dabberd, Walter F. ;
CORP Author Stanford Research Inst., Menlo Park, Calif.
Year Published 1972
Report Number CAPA-3-68(1-69)-CRC; SRI-8563; 1172;
Stock Number PB-210 819
Additional Subjects ( Air pollution ; Atmospheric diffusion) ; ( Carbon monoxide ; Atmospheric diffusion) ; ( Urban areas ; Air pollution) ; Mathematical models ; Wind(Meteorology) ; Mixing ; Temperature ; Field tests ; Streets ; Exhaust gases ; Diurnal variations ; Missouri ; Saint Louis(Missouri)
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB-210 819 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 162p
Abstract
An experimental program was conducted in St. Louis for the further development and testing of a practical, multipurpose urban diffusion model (APRAC-1A) for carbon monoxide to determine whether earlier (1970) findings in San Jose, California could be generalized to larger cities with highly developed urban cores. Two adjacent downtown street canyons were instrumented to obtain measurements of CO concentration at 30 points and winds at eight. Helicopter-and van-borne instrumentation was used to supplement data collected with the automated street-canyon instrumentation system. The model was revised to improve the specification of atmospheric stability and small-scale street-canyon effects. The distribution of CO in the street canyon indicates the presence of a single-cell, helical circulation in the deep St. Louis street canyons under cross-street, roof-level flow conditions; the same pattern was found in the shallow San Jose canyon.