A critical consequence of sprawling development and reliance on highways as a principal means of transportation is tailpipe pollution. Evidence is increasing that air pollution from vehicles increases a wide range of health risks. This report by the Sierra Club summarizes more than 24 peer-reviewed studies that document health hazards caused by pollution from cars, trucks, and other vehicles, highlighting links from pollution from motor vehicles to a range of human health problems including asthma, lung cancer and premature death. Download the report at //www.sierraclub.org/sprawl/report04_highwayhealth/report.pdf.