RT Journal Article SR Electronic T1 Oxidative stress: its role in air pollution and adverse health effects JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 612 OP 616 DO 10.1136/oem.60.8.612 VO 60 IS 8 A1 Frank J Kelly YR 2003 UL http://oem.bmj.com/content/60/8/612.abstract AB