||Trends of In-Vehicle CO Exposures on a California Arterial Highway Over One Decade.
Ott, W. ;
Switzer, P. ;
Willits, N. ;
Hildemann, L. ;
Yu, L. ;
||Stanford Univ., CA. ;California Univ., Davis. Intercollege Div. of Statistics.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Carbon monoxide ;
Air pollution monitoring ;
Vehicle air pollution ;
Exhaust gases ;
Exhaust emission measurement ;
Air pollution control devices ;
Air pollution research ;
Arterial highways ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||In 1980-81, carbon monoxide (CO) exposures were measured inside a motor vehicle during 88 standardized drives on a California urban arterial highway, El Camino Real (traffic volume of 30,500-45,000 vehicles per day), over a 13-1/2 month period, yielding the first known data set of vehicular exposures over an entire year. Because of the highly standardized nature of the approach, it was possible to repeat the entire experiment in 1991, more than a decade later. Similar driving patterns were maintained, and data were collected on the Surrounding Vehicle Count, a measure of traffic congestion at intersections along the way. Over the 11-year period, the exposures have decreased by 53%. A vehicular emissions model developed for the highway predicted a decline in emissions of approximately 52%, which agrees well with the change in exposures. In contrast, total emissions for the region, which takes into account increases in vehicle-miles due to additional highways, declined only 33%. Ambient concentrations decreased approximately 34% over the 11-year period. The results suggest that CO exposures measured on highways are a sensitive indicator of the effectiveness of vehicular emission control systems.
||Prepared in cooperation with California Univ., Davis. Intercollege Div. of Statistics. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
||Reprint: Trends of In-Vehicle CO Exposures on a California Arterial Highway Over One Decade.
||68A; 68G; 85H
||PC A03/MF A01