levels are measured by the province and reported every two hours from
7 a.m. to 7 p.m. By mid-morning yesterday, smog levels in Oakville were
poor at 52. By 3 p.m. the level had reached 67 and came back down to
64 by 7 p.m.
Toronto topped the scale on the mid-afternoon index at 74 with the east
and north ends of the city at 72 — the highest levels so far this year,
according to Ontario environment ministry air quality specialist David
are calling for more of the same and the smog advisory remains in effect
today across the GTA. Motor vehicles are a major source of smog.