Southern Nevada Air Quality Study - Final Report

The Southern Nevada Air Quality Study (SNAQS) created cross-plume and in-plume measurement systems to quantify emissions distributions and source profiles from transportation emissions, specifically gasoline and diesel powered vehicles. The cross-plume system measures backscattered ultraviolet radiation to estimate particulate emissions and infrared and ultraviolet absorption to measure gas concentrations in exhaust plumes. The in-plume system draws a portion of air from the plume and directs it to continuous monitors and filter samples that are analyzed in the laboratory. Both systems were applied to on-road measurements in Las Vegas, Nevada. Results from both methods found that most of the particulate and gas pollutant emissions came from a small fraction of the vehicles. High carbon monoxide emitters were not always high particulate matter and oxide of nitrogen emitters, implying that smog checks must measure all of these pollutants to be effective. Receptor models were applied to ambient particulate samples taken in Las Vegas using source profiles obtained with the in-plume system. Gasoline engine exhaust was the largest contributor to the carbon component at all sites, and diesel exhaust was only a large contributor at commercial sites near major highways. Residential wood combustion was also an important contributor in residential areas, but not in the commercial areas.


  • English

Media Info

  • Media Type: Print
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 54p

Subject/Index Terms

Filing Info

  • Accession Number: 01049674
  • Record Type: Publication
  • Report/Paper Numbers: DRI-03-10, FTA-NV-26-7003-2006.01
  • Contract Numbers: FTA 26-7003; FTA 26-7001-01; FTA 26-7003-02
  • Files: NTL, TRIS, USDOT
  • Created Date: May 21 2007 2:52PM