TRANSPORTATION SYSTEMS AND REGIONAL AIR QUALITY--A DIFKIN SENSITIVITY ANALYSIS

An analysis of the DIFKIN photochemical model characteristics and sensitivities to various input parameters is presented. DIFKIN is a trajectory type photochemical air quality simulation model. The most sensitive input parameters to Ozone production are initial concentrations, reaction rate constants, and inversion base height. The ratio of Reactive Hydrocarbons to Nitric Oxide emissions are far more important in determining Ozone production than the actual magnitudes for emissions. The DIFKIN model is most applicable to projects that result in changes in emissions in a few adjacent grid cells rather than widespread changes in emissions over an air basin. Five or more trajectories should be used to determine air quality impacts of a particular project.

  • Supplemental Notes:
    • Conducted in cooperation with DOT, Federal Highway Administration.
  • Corporate Authors:

    California Department of Transportation

    Transportation Laboratory
    5900 Folsom Boulevard
    Sacramento, CA  USA  95819
  • Authors:
    • Allen, P D
    • Crews, W B
    • Ranzieri, A J
    • Shirley, E C
  • Publication Date: 1976-4

Media Info

  • Pagination: 114 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158064
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-CA-76-27 Intrm Rpt.
  • Contract Numbers: A-8-27
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 13 1977 12:00AM