Smog advisory in effect for Toronto

The air quality health index in Toronto has exceeded a rating of seven on only two other days this year. (Dwight Friesen/CBC)

Environment Canada has issued a smog and humidex advisory for Toronto as temperatures remain unusually high Tuesday.

The high is expected to reach 33 C, even though it will feel more like the low 40s after factoring in humidity. The extreme heat alert issued by the City of Toronto on Monday remains in effect.

The average temperature for Aug. 31 historically is 23 C.

Meanwhile, smog is expected to hit southwestern Ontario on Tuesday. The Ontario Environment Ministry blames the smog on the hot and humid weather, a swell of polluted air wafting northeast from the United States and a “local buildup of pollutants.”

Environment Canada issues a smog advisory when a measure called the air quality health index is expected to exceed a reading of seven within the next 24 hours.

At that level, the air quality is deemed by Environment Canada to pose a “high risk” to health. As of about 8 a.m., the index for Toronto was at five. But Environment Canada predicts that reading will hit seven before the end of the day.

Once the air quality health index hits seven, people — particularly kids and senior citizens — are advised to reduce or reschedule strenuous activities. People with heart and lung conditions are also those most adversely affected by poor air quality.

The air quality index has hit seven on only two other days this year in Toronto — March 9 and July 7.

The UV index is also expected to reach eight, a very high reading, later Tuesday.

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Submited at Wednesday, September 1st, 2010 at 9:00 am on Health by blum
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