Wildfire smoke puts mask fit under the spotlight

New research and product testing highlight that a mask’s seal can matter as much as filtration as wildfire smoke spreads across Colorado, Utah, New Mexico and Florida. The release points to fit-test data, reusable mask studies and independent filter testing to argue that many people may be wearing masks that do not actually protect them well.

Why it matters: - Wildfire smoke across Colorado, Utah, New Mexico and Florida is pushing more people to rely on masks for protection. - Air quality officials have flagged PM2.5 as unhealthy for sensitive groups, including children, older adults and people with respiratory conditions. - The release argues that protection depends not only on filter certification, but on whether a mask seals correctly on an individual face.

What happened: - Colorado issued smoke advisories for Mesa, Garfield, Eagle, Pitkin and other counties as fires burned tens of thousands of acres near the Colorado-Utah line. - Smoke settled over Aspen, Vail and Grand Junction in Colorado. - In New Mexico, smoke from fires near the Tusas Valley reached Albuquerque. - In Florida, smoke from fires in western Miami-Dade County drifted into Broward County. - A PLoS ONE study from Tongji Medical College, Huazhong University of Science and Technology, quantitatively fit-tested 50 adults on 10 widely sold N95 models. - Only 7.8% of the 1,500 individual fit tests passed. - 27 of the 50 participants, or 54%, could not achieve a passing fit with any of the 10 models. - In 219 of 500 wearer-respirator combinations, participants believed the mask was not leaking, but only 24 of those combinations, or 4.8%, actually passed the objective fit test.

The details: - A 2017 study retested 22 healthcare workers a median of four years after their original N95 fit test. - Only 9 of the 22 workers, or 41%, still passed. - A Totobobo mask fitted in the same session passed for 10 of 22 workers, or 45%. - A 2010 trial found fresh fit-tested N95 masks passed for 19 of 22 participants, or 86%, while Totobobo masks passed for 16 of 22, or 73%. - The 2010 trial also found N95 masks had a significantly higher median filtration reduction. - A 2022 study found 45% of 49 participants passed a quantitative fit test on the first attempt with a Totobobo mask. - After visible-seal molding and refitting, pass rates rose to 77% and held up over repeated cleaning cycles. - Nelson Laboratories independently tested Totobobo’s F96 filter material and measured 99.86% particle capture at 0.1 microns. - The company says 0.1 microns is smaller than the sub-2.5-micron particles typical of wildfire smoke. - Filter efficiency measures the material only and does not show how well a mask seals to an individual face. - Totobobo says the moldable format is designed in part to fit face shapes that standard fixed-size respirators may not, including children’s. - Totobobo masks are not NIOSH-certified respirators and are not marketed as a substitute for certified respiratory protection in occupational or high-hazard settings. - The company recommends that people with underlying health conditions consult a physician about respiratory protection during wildfire smoke events. - Francis Chu, product designer and founder of Totobobo, said parents often cannot tell whether a mask is actually working or merely sitting on a child’s face. - Chu said the company designed Totobobo to help people see the seal instead of guessing. - The full review of the underlying research is available as Why a Mask's Fit Is the True Measure of Protection. - Totobobo says its masks are used by commuters, cyclists and families managing everyday and wildfire-related air pollution.

Between the lines: - The research cited in the release points to a persistent gap between how masks are marketed and how they perform on real faces. - The strongest theme is not that filtration does not matter, but that filtration alone is not enough if the seal fails. - The emphasis on visible fit reflects a consumer problem: many people do not know whether a mask is leaking until they are tested. - The wildfire smoke backdrop gives the research immediate relevance, especially for people in regions hit by repeated smoke advisories.

What’s next: - Totobobo is continuing to position its reusable, custom-moldable masks for everyday pollution and wildfire smoke use. - The company is directing readers to the full research review for more detail on fit and protection. - People with medical conditions are being advised to speak with a physician before relying on any mask during smoke exposure.

The bottom line: - The release’s core message is simple: a mask’s protection depends on both the filter and the seal, and many wearers may not know whether either one is working.