Should masks while flying continue?
After a judge overturned a CDC mandate that U.S. airlines require passengers to wear masks on airplanes, the TSA immediately stopped enforcing masking in airports. One viral video even showed a flight attendant walking down an airplane aisle asking people to throw their masks away. But with COVID-19 cases on the rise again, what does mask-abandonment mean for public health? Even if you don’t have to wear a mask on a plane, should you?
Science has brought us great advances in pharmaceutical interventions such as vaccines and treatments, but it’s provided little new information about the value of non-pharmaceutical interventions.
We know far less than we should about the COVID-19 risks associated with flying or the benefits of requiring cloth and surgical masks. We know people decrease their risk of getting sick when they wear an N95 respirator while around other people. Reducing your own risk also protects others, since you can’t give anyone COVID19 if you never get infected.
But far too little attention has focused on measuring the impact of public health measures. American public health officials simply decided that mandating face coverings would be our primary nonpharmaceutical intervention, under the assumption that we needed something to protect people while reopening the economy. But that was an assumption — and one that hasn’t been rigorously tested.
Several attempts at controlled trials showed a small benefit for universal masking with surgical masks — a 10% reduction in cases. Harvard medical professor Edward Nardell says there’s good data showing surgical masks in a hospital setting reduced transmission of TB — not COVID — by about 50%. It’s a different situation, but he thinks it’s reasonable to assume surgical masks help somewhat.
In a recent interview, University of Minnesota epidemiologist Michael Osterholm pointed out that mask mandates may give people a false sense of safety. There’s little data on the benefit of cloth masks, and those are the masks that lots of people
have been wearing on planes. Worse, lots of passengers remove their masks for large portions of a fight while they eat or drink. If the array of loose-fitting masks most people wear aren’t stopping airborne transmission, people might be taking more risks than they realize.
Air flow is good on airplanes, so the risks aren’t nearly as bad as being in a similar-sized stuffy room full of other people, but there is some danger. Harvard’s Nardell said he’d recommend people who are at higher risk, or just especially cautious, wear a fitted mask such as an N95.
Not all high-risk conditions are alike, so it’s a good idea to consult your doctor before booking a flight, said Leonard
Marcus, co-director of the National Preparedness Leadership Initiative at Harvard University. That would be a good idea even with the mask mandate, though he thinks the end of the mandate will make flying somewhat more risky. He also said airplane masking doesn’t have to be all black or white; for example, at times when cases are low, vaccinated people might make a reasonable choice to take off their mask to eat and drink. However, he said right now U.S. cases are edging upward and we could see a new surge with new subvariants of omicron BA.2.
This is not a good time to scale back on research and mitigation efforts. Scientists and public health officials should be
doing more to learn how to keep people safer. We need more free tests, more help with getting immune-compromised people antiviral drugs, more nudges to get older people boosted and more scientific research on which activities and situations pose the biggest threats.
Experts I interviewed earlier in the pandemic said they saw no downside to universal masking and a potential upside, so it seemed reasonable to do it without much data. It’s ridiculous that two years in, we still don’t have the data we need to know how valuable masking is — or isn’t.