Task 60, FY 1994, "Support for Implementing the Clean Air Act Amendments of 1990" (Apogee Research, Inc. Richard R. Mudge). In recent times, nothing has had the potential to impact the provision of transportation facilities and services like the Clean Air Act Amendments (CAAA) of 1990. To meet the challenge presented by the CAAA and to do their share in providing clean air, state DOTs need a common, comprehensive, overall plan to guide their actions. In the end, state DOTs want to strike a responsible balance among environmental, economic, and mobility needs. To accomplish this, they need to develop partnerships between public and private sectors and involved public interest groups. It is imperative that state DOT forces and other concerned personnel be provided with the most current information on activities to implement the CAAA. Decision makers, such as transportation Chief Administrative Officers (CAOs), governors, and state and federal lawmakers and regulators, also need better and more complete information about the CAAA and the role of transportation in the implementation of the Act. The objective of this effort is to help the state DOTs implement the CAAA by providing complete and accurate information and developing educational packages to show the DOTs how to use this information constructively. In the short term, information dissemination is probably the most timely and cost-effective action that will help the state DOTs. Most of this information will come from areas that are new to the states, necessitating practical guidance. This project was initiated by the AASHTO Standing Committee on Environment. The project produced a CAAA handbook and several companion pieces on the Clean Air Act. The project is complete.