DETERMINING THE DISPERSION OF ASPHALT EMISSIONS

Studies determined that the Gaussian Dispersion Model representing the "worst case" condition of the Air Quality Display Model should be used as a conservative determination of asphalt emission concentrations likely to occur in the vicinity of an asphalt mix plant, as a result of hot-mix pugmill mixing operations. This method provides a simplified and convienient means for determining air pollutant concentrations at varying downwind distances from the hot mix plant. Typical source concentration values for various emissions at asphalt hot- mix plants are tabulated, and the conversion of emission concentration units is detailed. The estimation of the source strength of emissions (required for this procedure) is described, and graphs are given for determining correction factors for meteorological stability classes as a function of the effective height of the emission source and the downwind distance. Nomographs for determining ground level concentration of emissions at a selected downwind distance from the source are presented. An example is given of the application of the procedure.

• Corporate Authors:

  Asphalt Institute

  2696 Research Park Drive
  Lexington, KY  United States  40511-8480
• Publication Date: 1976-8

Media Info

• Features: Figures;
• Pagination: 13 p.

Subject/Index Terms

• TRT Terms: Air pollution; Asphalt; Asphalt plants; Contaminants; Pollutants
• Old TRIS Terms: Dispersion
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00145007
• Record Type: Publication
• Report/Paper Numbers: MISC-76-2
• Files: TRIS
• Created Date: Feb 1 1977 12:00AM