Can face masks help protect you from wildfire smoke? Health expert explains
As wildfires continue to burn in several provinces, smoky skies across parts of the country are prompting recommendations from health officials to wear face masks to avoid inhaling harmful smoke.
Health Minister Jean-Yves Duclos told reporters on Wednesday morning that he was feeling the impacts of the smoky air and encouraged people, especially those with pre-existing respiratory conditions, to wear an N95 mask.
“So, for all of these people, including others that may want to protect themselves against the bad consequences of bad quality air, wearing an N95 mask is the recommended procedure by health authorities," Duclos said on Wednesday.
He noted while wearing a mask is a personal choice, he still recommends Canadians wear one if they're outdoors, as the air quality is among the worst in the world.
“But we also know that these consequences will be worse, as the extent of the bad air quality continues. We are told by firefighters and other health officials that, unfortunately, the situation will continue for a few more days.”
WHY INHALING WOOD SMOKE IS HARMFUL
As of Wednesday evening, several major cities across the country are reporting a moderate- to high-risk on the Air Quality Health Index including Vancouver, Edmonton, Saskatoon, Regina, Toronto and Ottawa. What's especially harmful about the current air quality in most regions are the extremely small particles—called fine particulates—that can travel into the lungs when we breathe, explains Joe Fida, CIO of Canadian air purifier company Blade Air.
"It is generally not healthy because it can cause inflammation, swelling—there's a lot of very adverse effects from it and the other problem is that they stay airborne for a very long time," Fida told CTVNews.ca in a phone interview on Wednesday.
Fida explains these fine particulates, known as PM 2.5, are 2.5 microns in diameter, however, smaller particles can travel further distances and contaminate the air.
"Of course (larger) particulates still travel about 30 to 100 kilometres from the fire but when you look at the fine particulates, they can travel for thousands of kilometres—minutes to hours of airborne travel. But then when you talk about ultra fine particulates, that's several days or weeks they can be airborne and travel; this is what's causing a lot of the pollution downwind of where the fires are occuring."
Dr. Shawn Aaron, respirologist at the Ottawa Hospital Research Institute, told CTVNews.ca in a phone interview on Wednesday fine particulates that are swirling in the air in high concentrations can enter into a person's lungs and travel into their bloodstream causing the body to react in an inflammatory way.
SHORT AND LONG-TERM EFFECTS OF INHALING WOOD SMOKE
Everyone can be made vulnerable to the effects of inhaling wood smoke, says Aaron. Instant symptoms of smoke inhalation can include stinging, watery eyes, and excess mucus production in the throat and nose.
For those who breathe in wood smoke for longer periods of time or have a pre-existing respiratory condition like asthma, Dr. Aaron said the body's airway tubes that bring air into the lungs can become swollen and tight, causing issues like coughing, wheezing or shortness of breath.
Additionally, inhaling wood smoke can also trigger an asthma attack in those with a history of lung disease or other chronic respiratory illness.
"The short term impacts of breathing in smoke can actually end up in an asthma or COPD attack where you actually become very short of breath and your airway spasms and you have to see a physician or go to the emergency department," he said.
Aaron adds long-term effects can include blood clots which could lead to angina or heart attacks. Additionally, prolonged exposure to wood smoke can also damage the body's airway cells that break down mucus produced in the lungs and allow the body to properly breathe and clear the lungs. Smoke can "paralyze" these airway cells, allowing the body to clog with mucus and leaving it vulnerable to other infections and bacteria.
"We see increased lung infections and increased risk of pneumonia for days after higher pollution days like today," Aaron said.
SHOULD I BE WEARING AN N95 FACE MASK?
By using a face mask when outdoors, specifically an N95 mask, Canadians can reduce their risk of respiratory harms, said Aaron.
N95 masks are used to protect against 95 per cent of particulates which is why they're the recommended face mask, he said, however cloth or paper face masks can provide some mild protection against wildfire smoke.
"You're going to be exposing yourself to a lot fewer of these microscopic dust particles if you're wearing an N95 and that'll be a lot better than if you're wearing your cloth mask or paper mask," Aaron said.
Despite this, he recommends everyone stay indoors and avoid going outside if they can. Aaron says since N95 face masks can protect from fine particulates, they may not be able to fully protect people from volatile gasses being produced by the fires that continuously pollute the air.
For those remaining indoors with the windows and doors shut, additional air filtration can also ensure the indoor air quality remains clean, Fida recommends.
"Even after the pandemic we've seen many countless air threats already in just a few years. Every time you turn around, there's something else threatening our air quality," Fida said.
Having an installed air filtration system like a furnace can be especially useful during high-risk air quality warnings; however portable air purifiers can also be a more affordable option to keep the air in the home purified.
CTVNews.ca Top Stories

Health Canada recalls multiple Rainbow Road Board books due to choking hazard
Health Canada has issued a recall notice affecting multiple Rainbow Road Board books due to a potential choking hazard.
U.S., India talking about Canada murder, no 'special exemption': Biden adviser
The U.S. is in touch with Indians at high levels after Ottawa said Indian government agents had links to the murder of a Sikh separatist leader in Canada, and Washington is giving India no 'special exemption' in the matter, U.S. national security adviser Jake Sullivan said on Thursday.
Ukrainian President Volodymyr Zelenskyy set to arrive in Ottawa for first visit since war
Ukrainian President Volodymyr Zelenskyy is set to arrive in the national capital for his first official visit to Canada since Russia launched a full-scale invasion in February 2022.
B.C. First Nation research finds 158 child deaths at four facilities
An investigation into unmarked graves and missing children by British Columbia's Sto:lo Nation has revealed at least 158 deaths, most of them at an Indigenous hospital.
Is a 'no-tipping' policy ready to be adopted by Canadian restaurants?
As Canadians report their frustrations with 'out-of-control' tipping culture, some wonder whether it is time to remove the option to tip at restaurants and is it even possible amid rising food costs?
Canadian-founded Rumble slams 'deeply inappropriate' inquiry from U.K. MPs on Russell Brand content
A Canadian-founded video platform which has found success among right-wing commentators says it will not be removing the ability for Russell Brand to monetize videos on their platform after receiving an inquiry on the subject from the U.K. government amid a wave of sexual assault allegations against the comic.
Law firm awarded $4.5 million contract for David Johnston foreign interference probe
A Toronto-based law firm was awarded a nearly $4.5 million contract to work on former special rapporteur David Johnston's ill-fated foreign interference probe.
Man admits to fatally poisoning Toronto toddler's breakfast cereal in 'obsessive' plot against married woman
A Toronto man has admitted to fatal poisoning of a toddler's breakfast cereal at a Scarborough residence in 2021 as part of an "obsessive" plot against a married woman.
'I don't know when we'll go': Travel plans upended amid fraying Canada-India ties
Members of the Indo-Canadian community are reeling after the Indian government suspended visa services for citizens of Canada, upending travel plans for those set on visiting the country but now caught in the crossfire of a diplomatic blowup.