TY - JOUR T1 - Smog advisories help Ontarians cope with increased pollution JF - Canadian Medical Association Journal JO - CMAJ SP - 237 LP - 237 VL - 161 IS - 3 AU - Barbara Sibbald Y1 - 1999/08/10 UR - http://www.cmaj.ca/content/161/3/237.1.abstract ER -