In order to determine the changes in air quality along major freeways resulting from the introduction of catalysts or other control devices on automobiles to reduce the emissions of carbon monoxide and hydrocarbons, measurements of the air quality were performed just before catalyst equipped vehicles were introduced. Data were collected for 12 days in August and September 1974 on either side of the San Diego Freeway in Los Angeles just south of Wilshire Boulevard. Measurements included meteorologial conditions, trace gas concentrations, aerosol number concentrations and size distributions, and two-hour filter samples which were analyzed for a number of elements and species. The data have been edited and collected into a data base of 10-minute, one-hour, and two-hour averages. All known limitations in the data are carefully described. Pollutant concentration differences due to the traffic are tabulated, as well as concentration differences divided by the NOx concentration difference. Reduced nitrogen and sulfur species were observed, as well as a volatile sulfur component in the aerosol. A new method of reducing electrical aerosol analyzer data was developed. (Portions of this document are not fully legible)

  • Corporate Authors:

    Rockwell International

    Air Monitoring Center
    Newbury Park, CA  United States 

    California Air Resources Board

    1001 I Street, P.O. Box 2815
    Sacramento, CA  United States  95812
  • Authors:
    • Richards, L W
    • Wang, H H
    • Harker, A B
  • Publication Date: 1977-6

Media Info

  • Pagination: 322 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00181816
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: SC592.5FR Final Rpt., ARB-R-4-335-77-73
  • Contract Numbers: ARB-3-986, ARB-4-335
  • Files: TRIS
  • Created Date: Oct 31 1978 12:00AM