She said on Tuesday that Urgences-Sante had reported a 30 per cent rise in ambulance transports since the beginning of the heat wave, up to about 1,200 per day.
The city is in the midst of an "extreme heat event", Environment Canada said in its warning on Sunday.
Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.
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As Glenn Frey once sang, the heat is on - and will stay on for Windsor-Essex until at least Thursday, according to Environment Canada.
Premila D'Sa is a breaking news reporter, working out of the Star's radio room in Toronto.
The sizzling temperatures over the long weekend are expected to continue through much of the work week, as the humidex once again soars to the 40 mark. A high of 26 and low of 14 is expected in Toronto on Friday, Ms. Hobelman said, with a chance of showers and a thunderstorm.
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Montreal health officials said there have been 12 heat-related deaths since the weekend, while authorities in the Eastern Townships region east of Montreal are attributing another five deaths to the weather.
All seven cooling centres in the city are open. Areas near the lake shores will be cooler.
He says most vulnerable to become sick due to high heat and humidity are infants, young children, the elderly and people with chronic health conditions like lung or heart problems.
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The Salvation Army was out at Gore Park handing out bottles of water reminding people to heed the warnings and protect themselves, and police have already received a number of calls including one on Appleby Line and Upper Middle Road in Burlington where they rescued a dog from a hot vehicle where the temperature was 66 degrees.