TRANSPORTATION SYSTEMS AND REGIONAL AIR QUALITY - EVALUATION OF A MODIFIED APRAC-1A CARBON MONOXIDE DIFFUSION MODEL FOR THE SACRAMENTO REGION

A validation study and sensitivity analysis of the APRAC-1A Gaussian model for predicting concentrations of carbon monoxide (CO) is reported. Bag samples of CO were collected at nine (9) locations in urban Sacramento during the winter of 1974. Model predictions were compared to the field measurements. The Model underpredicted station values by an average of 170%. After this work was completed, temperature corrections for motor vehicles, CO emissions, EPA published information indicated that CO emission rates were underestimated by about 150 to 200%. If this correction were applied the average predictions from APRAC should be very close to the measurements. The sensitivity analysis indicates that maximum CO predictions vary linearly with emissions.

• Supplemental Notes:
  • See also report dated Apr 76, PB-268 329.
• Corporate Authors:

  California Department of Transportation

  Transportation Laboratory
  5900 Folsom Boulevard
  Sacramento, CA  United States  95819

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Racin, J A
  • Allen, P D
  • Ranzieri, A J
• Publication Date: 1976-4

Media Info

• Pagination: 93 p.

Subject/Index Terms

• TRT Terms: Air pollution; Alternatives analysis; Carbon monoxide; Concentration (Chemistry); Exhaust gases; Forecasting; Management; Mathematical models; Meteorological phenomena; Performance evaluations; Planning; Sensitivity; Tables (Data); Traffic; Velocity; Wind
• Uncontrolled Terms: Wind direction
• Old TRIS Terms: Management planning; Meteorological data; Wind velocity
• Subject Areas: Administration and Management; Operations and Traffic Management; Planning and Forecasting;

Filing Info

• Accession Number: 00167310
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 657169, FHWA/CA-76-30, Interim Report
• Files: NTIS, USDOT, STATEDOT
• Created Date: Nov 23 2003 12:00AM