摘要: |
Case studies of the air quality conformity processes in the Denver, Raleigh-Durham, Philadelphia, and Washington, D.C., nonattainment areas were conducted. The U.S. Department of Transportation's Volpe National Transportation Systems Center conducted these case studies on behalf of FHWA. The case studies focused on travel demand and air quality modeling and included information on regional demographic and economic forecasting, jurisdictional and institutional issues, and technical issues and concerns. This information was intended to help FHWA carry out its responsibilities under the Clean Air Act Amendments of 1990 and set priorities for federal activities in such areas as research and development, development of technical guidance, and information dissemination. Another case study objective was to provide information that other urbanized areas could use to improve their conformity procedures and establish benchmarks for them to assess results. |