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Tag: scientific literature

  • Was the COVID Toilet Panic Overblown?

    Was the COVID Toilet Panic Overblown?

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    In the dark early days of the pandemic, when we knew almost nothing and feared almost everything, there was a moment when people became very, very worried about toilets. More specifically, they were worried about the possibility that the cloud of particles toilets spew into the air when flushed—known in the scientific literature as “toilet plume”—might be a significant vector of COVID transmission. Because the coronavirus can be found in human excrement, “flushing the toilet may fling coronavirus aerosols all over,” The New York Times warned in June 2020. Every so often in the years since, the occasional PSA from a scientist or public-health expert has renewed the scatological panic.

    In retrospect, so much of what we thought we knew in those early days was wrong. Lysoling our groceries turned out to not be helpful. Masking turned out to be very helpful. Hand-washing, though still important, was not all it was cracked up to be, and herd immunity, in the end, was a mirage. As the country shifts into post-pandemic life and takes stock of the past three years, it’s worth asking: What really was the deal with toilet plume?

    The short answer is that our fears have not been substantiated, but they weren’t entirely overblown either. Scientists have been studying toilet plume for decades. They’ve found that plumes vary in magnitude depending on the type of toilet and flush mechanism. Flush energy plays a role too: The greater it is, the larger the plume. Closing the lid (if the toilet has one) helps a great deal, though even that cannot completely eliminate toilet plume—particles can still escape through the gap between the seat and the lid.

    Whatever the specifics, the main conclusion from years of research preceding the pandemic has been consistent and disgusting: “Flush toilets produce substantial quantities of toilet plume aerosol capable of entraining microorganisms at least as large as bacteria … These bioaerosols may remain viable in the air for extended periods and travel with air currents,” scientists at the CDC and the University of Oklahoma College of Public Health wrote in a 2013 review paper titled “Lifting the Lid on Toilet Plume Aerosol.” In other words, when you flush a toilet, an unsettling amount of the contents go up rather than down.

    Knowing this is one thing; seeing it is another. Traditionally, scientists have measured toilet plume with either a particle counter or, in at least one case, “a computational model of an idealized toilet.” But in a new study published last month, researchers at the University of Colorado at Boulder took things a step further, using bright-green lasers to render visible what usually, blessedly, is not. John Crimaldi, an engineering professor and a co-author of the study, who has spent 25 years using lasers to illuminate invisible phenomena, told me that he and his colleagues went into the experiment fully expecting to see something. Even so, they were “completely caught off guard” by the results. The plume was bigger, faster, and more energetic than they’d anticipated—“like an eruption,” Crimaldi said, or, as he and his colleagues put it in their paper, a “strong chaotic jet.”

    Within eight seconds, the resulting cloud of aerosols shoots nearly five feet above the toilet bowl—that is, more than six feet above the ground. That is: straight into your face. After the initial burst, the plume continues to rise until it hits the ceiling, and then it wafts outward. It meets a wall and runs along it. Before long, it fills the room. Once that happens, it hangs around for a while. “You can sort of extrapolate in your own mind to walking into a public restroom in an airport that has 20 toilet stalls, all of them flushing every couple minutes,” Crimaldi said. Not a pleasant thought.

    The question, then, is not so much whether toilet plume happens—like it or not, it clearly does—as whether it presents a legitimate transmission risk of COVID or anything else. This part is not so clear. The 2013 review paper identified studies of the original SARS virus as “among the most compelling indicators of the potential for toilet plume to cause airborne disease transmission.” (The authors also noted, in a dry aside, that although SARS was “not presently a common disease, it has demonstrated its potential for explosive spread and high mortality.”) The one such study the authors discuss explicitly is a report on the 2003 outbreak in Hong Kong’s Amoy Gardens apartment complex. That study, though, is far from conclusive, Mark Sobsey, an environmental microbiologist at the University of North Carolina at Chapel Hill, told me. The researchers didn’t rule out other modes of transmission, nor did they attempt to culture live virus from the fecal matter—a far more reliable indicator of infectiousness than mere detection.

    Beyond that, Sobsey said, there is little evidence that toilet plumes spread SARS or COVID-19. In his own review, published in December 2021, Sobsey found “no documented evidence” of viral transmission via fecal matter. This, at least, seems to track with the three years of pandemic experience we’ve all now endured. Although we can’t easily prove that bathrooms don’t play a significant role in spreading COVID-19, we haven’t seen any glaring indications that they do. And anyway, the coronavirus has found plenty of other awful ways to spread.

    Just because toilet plume doesn’t seem to be a vector of COVID transmission, though, doesn’t mean you can forget about it. Gastrointestinal viruses such as norovirus, Sobsey told me, present a more serious risk of transmission via toilet plume, because they are known to spread via fecal matter. The only real solutions are structural. Improved ventilation would keep aerosolized waste from building up in the air, and germicidal lighting, though the technology is still being developed, could potentially disinfect what remains. Neither, however, would stop the plume in the first place. To do that, you would need to change the toilet itself: In order to create a smoother and thus better-contained flush, you could change the geometry of the bowl, the way the water enters and exits, or any number of other variables. Toilet manufacturers could also, you know, stop producing lidless toilets.

    But none of that will save you the next time you find yourself staring into a toilet’s blank maw. Crimaldi suggests wearing a mask in public bathrooms to protect against not just the plume created when you flush but also the plumes left by the person who used the bathroom before you, the person who used it before them, and so on. You don’t need to have any great affection for masking as a public-health intervention to consider donning one for a few minutes to avoid literally breathing in shit. Sobsey offered another bit of unconventional bathroom-hygiene advice, which he acknowledged can only do so much to protect you: If you find yourself in a public restroom with a lidless toilet, he said, consider washing your hands before you flush. Then “hold your breath, flush the toilet, and leave.”

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    Jacob Stern

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  • Are Gas Stoves Doomed?

    Are Gas Stoves Doomed?

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    Somehow, in a few short days, gas stoves have gone from a thing that some people cook with to, depending on your politics, either a child-poisoning death machine or a treasured piece of national patrimony. Suddenly, everyone has an opinion. Gas stoves! Who could have predicted it?

    The roots of the present controversy can be traced back to late December, when scientists published a paper arguing that gas stoves are to blame for nearly 13 percent of childhood asthma cases in the U.S. This finding was striking but not really new: The scientific literature establishing the dangers of gas stoves—and the connection to childhood asthma in particular—goes back decades. Then, on Monday, the fracas got well and truly under way, when Richard Trumka Jr., a member of the Consumer Product Safety Commission, said in an interview with Bloomberg News that the commission would consider a full prohibition on gas stoves. “This is a hidden hazard,” he said. “Any option is on the table. Products that can’t be made safe can be banned.”

    Just like that, gas stoves became the newest front in America’s ever expanding culture wars. Politicians proceeded to completely lose their minds. Florida Governor Ron DeSantis tweeted a cartoon of two autographed—yes autographed—gas stoves. Representative Jim Jordan of Ohio declared simply: “God. Guns. Gas stoves.” Naturally, Tucker Carlson got involved. “I would counsel mass disobedience in the face of tyranny in this case,” he told a guest on his Fox News show.

    No matter that Democrats are more likely to have gas stoves than Republicans, and in fact the only states in which a majority of households use gas stoves—California, Nevada, Illinois, New York, New Jersey—are states that went blue in 2020. Why let a few pesky facts spoil a perfectly good opportunity to own the libs? The Biden administration, for its part, clarified yesterday that it has no intention of banning gas stoves. In the long run, though, this may prove to have been more a stay of execution than a pardon.

    Beyond the knee-jerk partisanship, the science of gas stoves is not entirely straightforward. Emily Oster, an economist at Brown University, suggested in her newsletter that the underlying data establishing the connection between gas-stove use and childhood asthma may not be as clear-cut as the new study makes it out to be. And because those data are merely correlational, we can’t draw any straightforward causal conclusions. This doesn’t mean gas stoves are safe, Oster told me, but it complicates the picture. Switching from gas to electric right this minute probably isn’t necessary, she said, but she would make the change if she happened to be redesigning her kitchen.

    Whatever the shortcomings of the available data, it’s clear that gas stoves are worse for the climate and fill our homes with pollutants we’re better off not inhaling. Brady Seals, a manager at the Rocky Mountain Institute and a lead author of the new paper, told me that even assuming the maximum amount of uncertainty, her work still suggests that more than 6 percent of childhood asthma cases in the U.S. are associated with gas stoves.

    Regardless of the exact science, gas stoves might be in trouble anyway. Statistically, they’re not all that deeply entrenched to begin with: Only about 40 percent of American households have one. Plus, induction stoves—a hyper-efficient option that generates heat using electromagnetism—are on the rise. “We’re not asking people to go back to janky coils,” said Leah Stokes, a political scientist at UC Santa Barbara who has provided testimony on the subject of gas stoves before the U.S. Senate, and who is currently in the process of installing an induction stove in her home.

    Rachelle Boucher, a chef who has worked in restaurants, in appliance showrooms, and as a private cook for such celebrity clients as George Lucas and Metallica, swears by induction. She started using it about 15 years ago and has since become a full-time evangelist. (In the past, Boucher has done promotions for electric-stove companies, though she doesn’t anymore.) Induction, she told me, tops gas in just about every way. For one thing, “the speed is remarkable.” An induction stovetop can boil a pot of water in just two minutes, twice as quickly as a gas burner. For another, it allows for far greater precision. When you adjust the heat, the change is nearly instantaneous. “Once you use that speed,” Boucher said, “it’s weird to go back and have everything be so much harder to control.” Induction stoves also emit virtually no excess heat, reducing air-conditioning costs and making it harder to burn yourself. And they’re also easier to clean.

    Induction stoves do have minor drawbacks. Because they are flat and use electromagnetism, they aren’t compatible with all cookware, meaning that if you make the switch, you may also have to buy yourself a new wok or kettle. Flambéing and charring will also take a little longer, Boucher told me, but few home cooks are deploying those techniques on a regular basis. In recent years, induction has received the endorsement of some of the world’s top chefs, who have tended to be ardent gas-stove users. Eric Ripert, whose restaurant Le Bernardin has three Michelin stars, switched his home kitchens from gas to induction. “After two days, I was in love,” he told The New York Times last year. At his San Francisco restaurant, Claude Le Tohic, a James Beard Award–winning chef, has made the switch to induction. The celebrity chef and food writer Alison Roman is also a convert: “I have an induction stove by choice AMA,” she tweeted yesterday.

    If it’s good enough for them, it’s probably good enough for us. At the moment, induction stoves are more expensive than the alternatives, although their efficiency and the fact that they don’t heat up the kitchen help offset the disparity. So, too, do the rebates included in last year’s Inflation Reduction Act, which should kick in later this year and can amount to as much as $840. The price has been falling in recent years, and as it continues to come down, Stokes told me, she expects induction to overtake gas. A 2022 Consumer Reports survey found that while 3 percent of Americans have induction stoves, nearly 70 might consider going induction the next time they buy new appliances. “I think the same thing’s going to happen for induction stoves” as happened with electric vehicles, Stokes told me. In the end, culture-war considerations will lose out to questions of cost and quality. The better product will win the day, plain and simple.

    Still, gas stoves’ foray into the culture wars likely means that at least some Republicans will probably scorn electric stoves now in the same way they have masks over the past few years. And this whole episode does have a distinctly post-pandemic feel to it: the concern about the air we’re breathing, the discussion of what precautions we ought to take, the panic and outrage in response. The new gas-stove controversy feels as though it has been jammed into a partisan framework established—or at least refined—during the pandemic. “I don’t know if this discourse that we’re seeing now could have happened five years ago,” Brady Seals told me. Whatever happens to gas stoves, the public-health culture wars don’t seem to be going anywhere.

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    Jacob Stern

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