RT Journal Article SR Electronic T1 Improving Air Quality: Progress and Challenges for the Auto Industry JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 226 OP 226 DO 10.1136/oem.60.3.226 VO 60 IS 3 A1 M L Williams YR 2003 UL http://oem.bmj.com/content/60/3/226.abstract AB