||Weekend/weekday differences in oxidants and their precursors /
Horie, Yuji ;
Cassmassi, Joseph ;
Lai, Larry ;
||Technology Service Corp., Santa Monica, CA.;Environmental Protection Agency, Research Triangle Park, NC. Monitoring and Data Analysis Div.
|| U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards ; National Technical Information Service [distributor],
Oxidizing agents. ;
Air--Pollution--United States. ;
Atmospheric pressure--United States.
Air pollution ;
Urban areas ;
Nitrogen oxides ;
Atmospheric motion ;
Northeast Region(United States) ;
Air quality data
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||viii, 140 pages : illustrations, 1 map ; 28 cm
Differences between weekend and weekday oxidant and oxidant precursor concentrations in the Northeastern United States are examined. Statistical tests are employed to assess whether any differences in daily maximum oxidant concentrations are significant. Weekend/weekday differences in meteorology are also examined for any potential impact on weekend/weekday differences in oxidants. Oxidant concentrations are adjusted in an attempt to account for variations in meteorology, and weekend/weekday differences in the adjusted values are examined. Finally, statistical tests are used to determine significant differences in early morning oxidant precursor concentrations. The analyses revealed that oxidant concentrations downwind of major urban areas tend to be lower on weekends. However, the reductions are not as large as those observed in precursor concentrations within the major urban areas. Reductions in weekend oxidant concentrations at locations within the major urban areas are not as great as those at downwind locations.
"Technology Service Corporation." "March 1979." Includes bibliographical references (pages 110-111). "EPA-450/4-79-013." "Contract no. 68-02-2595." Microfiche.