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.
- See also report dated Apr 76, PB-268 329.
5900 Folsom Boulevard
Sacramento, CA United States 95819
Washington, DC United States 20590
- Racin, J A
- Allen, P D
- Ranzieri, A J
- Publication Date: 1976-4
- Pagination: 93 p.
- 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;
- 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