In Vancouver, the Air Quality Health Index (AQHI)—with 1 being the lowest health risk and 10 being the highest —sat at 8 (high risk) from 11 a.m., when an air quality advisory was continued for all of Metro Vancouver and the Fraser Valley, due to the health risk posed by wildfire smoke hanging over the region.
By 6:30 p.m., the AQHI had fallen to 6 (moderate risk) but the air quality advisory was renewed all the same.
The smoke blanketing Metro Vancouver contains high concentrations of fine particulate matter that can cause breathing problems for the very young, the very old, and anyone with a chronic health condition, and the smoke is not expected to dissipate anytime soon, according to Metro Vancouver:
Elevated levels of fine particulate matter are expected to persist until there is a change in weather and/or fire conditions.
In the meantime, the advisory warns:
Persons with chronic underlying medical conditions should postpone strenuous exercise until the advisory is lifted. Exposure is particularly a concern for infants, the elderly and those who have diabetes, and lung or heart disease. If you are experiencing symptoms such as chest discomfort, shortness of breath, coughing or wheezing, follow the advice of your healthcare provider. As we are in the summer season with warm temperatures, it is also important to stay cool and hydrated. Indoor spaces with air conditioning may offer relief from both heat and air pollution.
However, if the smoke does irritate your throat and/or make you short of breath, but you still have to be active outside, don’t worry, there’s a mask for that—just not the one that you always see some people in Vancouver wearing.
Masking the effect of pollution—disaster capitalism at work
Tuesday, I saw two cyclists in Fairview wearing snug-fitting pollution masks and two pedestrians wearing what were either paper surgical masks, or the gauze variety. The former really will protect your lungs but the latter is utterly useless.
According to the Metro Vancouver air quality advisory, the problematic fine particulate matter in wildfire smoke consists of airborne solids or liquid droplets with a diameter of 2.5 micrometres (µm) or less.
Good cycling pollution masks, with HEPA-type activated charcoal filters, are designed to block particles as fine as 0.99 µm and can also absorb the toxic gases in the smoke, such as carbon monoxide, formaldehyde, and acrolein. These masks start at about $80.
Actually, as air pollution increases around the world, pollution masks are increasingly not just for cyclists. A number of startups, like Sweden’s Airinum, are bringing new, fashion-conscious, “urban breathing masks” to market. And long-time cycling pollution mask makers, like Respro, have added masks aimed at urban pedestrians and the ability to personalize masks with fashionable skins.
A slim, lightweight pollution mask may be a practical long-term investment for a Vancouverite, given that periods of wildfire smoke are becoming an annual summer occurrence (in three of the last four years certainly).
Another kind of face mask that you can run out and buy that will give you some real protection from wildfire smoke is a respirator mask labeled “N95” or “N100,” according to information on the subject from the Washington State Department of Health.
The reusable variety starts in the $50 price range (not counting the pricey replacement filters).
Inexpensive disposable N95 respirator masks are available at most hardware and home improvement stores and large pharmacies, and will filter‐out the fine particles of wildfire smoke but not the hazardous gases.
They are generally sold in multiples. Unit prices I found in Vancouver stores (before taxes) ranged from $1.44 to $4.75.
Ideally, disposable N95 respirator masks are only expected to last a workday but extended reuse has apparently been common practice in some health-care settings, according the the CDC.
One phone call at noon on Tuesday found N95 respirator masks selling at the West 7th Avenue and Fir location of Windsor Plywood for $47.50, for a box of 10 masks—with only seven boxes in stock.
My first call to Home Depot resulted in a price of $13.98—apparently for one N95 mask but more checking on Wednesday found various Vancouver Home Depot locations selling three-packs of N95 respirator masks for $9.12 each.
The Canadian Tire store at Cambie and West 7th was selling 20-packs of N95 masks for $28.99. And Staples locations had 30-packs for $106.96 and 20-packs for $23.99.
If N95 respirator masks are too pricey for you, don’t bother buying anything cheaper.
Paper surgical masks are only designed to stop splashes and sprays of bodily fluids and comparatively huge respiratory droplets, ranging in size from 50 to 100 µm. The fine particulate matter of wood smoke can waft through these masks and even the simpler gauze ones, like mosquitoes on a breeze through an open window.
While the number and severity of wildfires across the province have continued to increase—leading the B.C. government to declare a provincewide state of emergency on Wednesday (August 15)—the amount of wood smoke from wildfires fouling Vancouver’s air has decreased. As of Thursday the Air Quality Health Index was at 5 (moderate risk) and on Friday it was 3 (low risk).