Wildfire Smoke Summers: Air-Quality Habits for Newcomers

Canadian summers are glorious right up until the sky goes orange. Wildfire smoke has become a part of most summers in the West and, increasingly, the East. Here is what it is, how to read the air-quality index, and the household habits that Canadians have quietly adopted.

What's actually happening

Canada's forests are vast and, in summer, dry. Fires — some started by lightning, some by people — burn every year across British Columbia, Alberta, the Prairies, northern Ontario and Québec. The fires themselves are usually far from the cities. The smoke isn't. Depending on the wind, a fire hundreds of kilometres away can drop a grey-brown haze over Vancouver, Calgary, Edmonton, Winnipeg, Toronto or Montréal for days or weeks. Some years are mild; some years are bad enough that the whole country talks about it.

For South Africans the closest reference is the Highveld winter smog or a Cape mountain fire, but the scale is different: this is regional, it can last, and it can arrive with a clear sky and no fire in sight.

Learn the AQHI

Canada uses an Air Quality Health Index — the AQHI — published by Environment and Climate Change Canada and the provinces. It runs on a simple scale from low risk through moderate and high to very high, and it's reported alongside the weather forecast on weather.gc.ca, in weather apps, and on provincial health sites. The habit to build is checking it the way you'd check for rain in summer. When it climbs, the advice changes for everyone, and it changes sooner for children, older people, pregnant women, and anyone with asthma, heart or lung conditions. Read the current guidance on the official site rather than relying on a number a friend quoted; the messaging is updated as the science develops.

You'll also hear about "fine particulate" or PM2.5 — the tiny particles in smoke that get deep into the lungs. That's the thing the index is mostly tracking on smoky days.

Household habits that Canadians have adopted

• Close up when it's bad. Windows shut, and if you have central air conditioning or a furnace fan, run it on recirculate with a good filter so you're not pulling outside air in. Canadians with older houses learned this the hard way.
• Get a portable air purifier. A HEPA-filter unit sized for the room you spend the most time in — often the bedroom — is the single most effective thing for a household without central filtration. They're widely sold; buy before the season, because they sell out during a bad week.
• Know your furnace filter. If you have forced-air heating, the filter rating matters. Higher-rated filters catch more smoke particles. Check what your system can handle, since too dense a filter strains the fan.
• Make a clean room. On the worst days, one sealed room with the purifier running is where the kids sleep and where anyone with breathing trouble spends the day.
• Masks for outdoors. Well-fitting respirator-style masks — the kind many people got used to during the pandemic — filter smoke particles. Cloth or surgical masks largely don't. Keep a few in the house.

Changing what you do, not just where you are

The other half is behaviour. On high-index days, Canadians shift or skip outdoor exercise — the morning run becomes an indoor session, the kids' soccer gets moved or cancelled, and schools and daycares keep children in at recess. Many cities open clean-air spaces in libraries and community centres. Pace yourself: even healthy adults notice a scratchy throat and a heaviness after a few smoky days, and it's normal to feel low and foggy. Drinking water, resting and staying inside are boring and effective.

If you or a family member has a condition that smoke aggravates, talk to a doctor or pharmacist before the season about a plan — inhalers, thresholds, when to seek care. This piece is not medical advice.

Cars, commutes and travel

Set the car's ventilation to recirculate on smoky days; cabin filters help, and replacing one is cheap. Driving with the windows down through a haze is how a lot of newcomers get a headache. Flights, particularly out of smaller airports, can be delayed by low visibility in a bad stretch. And road trips into fire regions may meet highway closures and evacuation orders — check the provincial wildfire and highway sites before setting out, and treat closures as absolute.

Where it's worse, where it's better

There's no smoke-free Canada, but exposure differs. The interior of British Columbia and central Alberta tend to see the most smoke and the earliest. Coastal Vancouver and Victoria often get relief from ocean winds, though not always. The Prairies get smoke from fires to the north and west. Ontario and Québec have had very bad years and quiet ones. Atlantic Canada is generally the least affected. If someone in your family has real respiratory sensitivity, that's a legitimate input into choosing a region — alongside the many other factors — and something to raise with a doctor.

Keeping perspective

Most summer days in most Canadian cities are clear and beautiful, and smoke is something you plan around rather than live under. But it is real, it's become more frequent, and the households that cope best are the ones that bought the purifier in May, know their index, and have a routine ready. Build the habits in your first summer and they'll be automatic by your second.

For more on the seasonal rhythm of settling in — winters, summers and everything in between — our guides are at /guides/.