MICROSCALE CARBON MONOXIDE CONCENTRATIONS AND WIND CHARACTERISTICS ON NEW YORK CITY STREETS

In order to determine the dispersal characteristics of carbon monoxide emissions from vehicles and the characteristics of wind flows in street canyons, measurements were made of carbon monoxide concentrations and wind conditions on rooftops and at street levels along with traffic flow for several weeks at 7 sites of differing geometries. Continuous monitoring was performed at both street and avenue sites in Manhattan. This model development program involved derivation of an analytic expression to calculate carbon comoxide concentrations and an analysis involving a stepwise linear regression procedure with both wind and carbon monoxide concentration parameters. This analysis resulted in the definition of several characteristics of wind fields in the street canyons. It was found that winds near the surface of the streets, which are 800 ft. long, are much better correlated to prevailing winds than those on the avenues which are 200 ft. long. In general, the surface winds are less than those at rooftop locations, and greater H (building height)/W (street width) ratios produce higher surface wind speeds. The results are also discussed of 1-way analysis of variance performed on air-bag samples acquired and anlayzed for carbon monoxide.

Media Info

  • Media Type: Print
  • Pagination: pp 198-199
  • Monograph Title: Assessing transportation-related air quality impacts
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00139665
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Sep 16 1976 12:00AM