Increased levels of air pollution and traffic congestion, coupled with regulatory requirements emanating from the Clean Air Act Amendments of 1990 make it a particularly relevant time to investigate the current status and future potential of Ridesharing in the urban areas of Southeastern Wisconsin. Ridesharing--which encompasses carpools, vanpools and related forms of public transportation--represents an effective means to reduce congestion on the region's major traffic arteries and automobile emissions which contribute to substantial air quality problems in the region. This newsletter presents the results of a recent study of Ridesharing conducted by the Urban Research Center at the University of Wisconsin--Milwaukee.