Toronto Star re smog, July 4, 03.

Air quality 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.

Downtown 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 Yap.

Forecasters 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.

 

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