DEVELOPMENT OF WORST CASE METEOROLOGY CRITERIA. FINAL REPORT

A meteorological severity index (MSI) representing the relationship between meteorological parameters that contribute to worst case carbon monoxide concentrations near roadways is described. The MSI is based on sensitivity studies of the California Lines Source Dispersion Model, CALINE4. Meteorological data collected at several monitoring sites throughout California are described. Probabilistic analysis of the monitoring data (stratified by geography and time-of-day) is combined with the MSI to develop worst case meteorolgy inputs for estimating 1-hour CO levels using CALINE4. Worst case meteorology inputs are presented using peak and off-peak conditions for estimating worst case 8-hour CO levels when running the CALINE4 model. An alternative method of estimating worst case 8-hour CO levels is given by describing a "persistence factor". Guidelines are presented to help CALINE4 users develop or estimate an appropriate persistence factor for a project location. The probabilistic method described in the report can be used to establish new worst case meteorology criteria in the event of changes in the number of exceedances allowed by the National Ambient Air Quality Standards. The variety of locations studied in California should make results of the study useable by other states.

• 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:
  • Nokes, W A
  • Benson, P E
• Publication Date: 1985-11

Media Info

• Pagination: 79 p.

Subject/Index Terms

• TRT Terms: Air pollution; Carbon monoxide; Concentration (Chemistry); Injury severity; Meteorology; Off peak periods; Peak periods; Probability
• Uncontrolled Terms: Concentration; Probabilistic analysis; Severity
• Old TRIS Terms: Dispersion; Off-peak
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00457922
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: FHWA/CA/TL-85/14, 54328-604196
• Contract Numbers: E80TL14
• Files: TRIS, USDOT, STATEDOT
• Created Date: Sep 30 1986 12:00AM