Environment Canada warns of heat and smoke in Montreal

Montreal Gazette

14-07-2025

By
After a weekend filled with humidity and heavy rain, Environment Canada issued an air quality statement and a heat warning for Montreal on Monday.
'When there is an extreme heat event occurring with poor air quality, prioritize keeping cool,' the advisory reads.
The weather agency says smoke from the Canadian Prairies is leading to 'poor air quality and reduced visibility' in the city, but conditions are expected to improve by Tuesday — just as the intense heat will be setting in.
'As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events,' the notice reads.
'You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough. More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a medical emergency, seek immediate medical assistance.'
Environment Canada says people who are likely to be affected — including seniors, pregnant people, young children, babies, anyone with a chronic illness or who works outside — should 'reduce or reschedule strenuous activities outdoors and seek medical attention if experiencing symptoms.'
Windows and doors should also be kept closed as much as possible when inside and indoor air should be protected from wildfire smoke through a 'good quality air filter' in the ventilation system, among other things. For anyone outside, the weather agency suggests a respirator mask, like an N95, can help.
Heat to settle in Tuesday
A heat warning is also in effect for Montreal and the surrounding areas, with the warm weather expected to return on Tuesday and Wednesday.
The forecasts highs are 31 to 33 C, but with combined humidity, it will feel closer to 40, and nights will also be warm, with lows from 20 to 23 C.
The weather agency recommends checking in on older adults, those living alone and other at-risk people multiple times a day. Montrealers should also be on the lookout for early signs of heat exhaustion, including headache, nausea, dizziness, thirst, intense fatigue and dark urine.
The weather agency says to call 911 if experiencing heat stroke symptoms. These include red and hot skin, dizziness, nausea, confusion and change in consciousness.
'While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body,' the warning reads.
During intense heat, it's recommended to drink water often, close blinds and shades, turn on air conditioning or use a fan, and move to the coolest space in your home.
'If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park,' Environment Canada says.