The news is discombobulating to those of us who thought we understood Covid spread. A rash of news stories this spring confirmed the safety of outdoor gatherings and argued that closing parks and beaches over Covid safety concerns was misguided. Members of Congress called the CDC's guidance over mask requirements at summer camps too restrictive, leading the agency to revise its recommendations. "It's not that they lied to you," Robert Siegel, a Stanford University microbiology and immunology professor, told Nightly. Siegel and other scientists were bracing themselves last summer for widespread Covid outbreaks in the wake of Black Lives Matters protests. No vaccines were available yet, and protestors didn't uniformly wear masks. But studies showed the events didn't contribute to Covid surges across the country, probably because many marches were outdoors. So why is Oregon imposing an outdoor mandate? The fast spread of Delta, even in states with high vaccination rates, has reopened old debates about Covid safety. Oregon is now averaging about 2,000 new cases a day. Hospitalizations are up nearly 50 percent over the past 14 days. The great outdoors may no longer be a safe haven, Siegel said. "If the same rallies occurred today, I would be concerned that the results wouldn't be the same," he said. Outdoor Covid transmission is still far less likely than indoor transmission, John Volckens, a mechanical engineering professor at Colorado State University who studies aerosol emissions, told Nightly. He admits we still don't have all the data about outdoor transmission versus indoor transmission from 2020, let alone data about the Delta variant. Still, think about hanging out with a smoker, he said. Outdoors, those cigarette plumes dissipate into the air or get swept away in the wind. So you're less likely to breathe in secondhand smoke. But the Delta variant is like a cigarette with more smoke coming out of it. Even outdoors you are at risk of catching a whiff, though if you are vaccinated you will likely be fine. "The Oregon rule is not being written for you and 10 other families at a park," Volckens said. "What it's being written for are outdoor concerts, where you are shoulder to shoulder with a thousand other people. You are going to share some air." Oregon's health officials suggest that if they wait for the data, they'll end up waiting too long. The state's history of acting before all the data is in has kept Oregon's death toll low throughout the past year and half, Tom Jeanne, a deputy state health officer and deputy state epidemiologist with the Oregon Health Authority, which advises the governor's office, told Nightly. Oregon has the sixth lowest Covid death rate in the country. There was some evidence of the need for an outdoor mask mandate based on the spread at music festivals this summer, Jeanne said. Local county officials tied at least 66 Covid cases to an outdoor festival in the eastern part of the state, which also has some of the lowest vaccination levels in Oregon. The timing of the Oregon's summer case surge points to at least some outdoor spread, said Dawn Nolt, an infectious disease specialist at Oregon Health & Science University. Nolt is skeptical of some reports about outdoor transmission, including the CDC's Provincetown study, arguing that it's hard to tease out whether spread occurred indoors or not. But Oregon is pleasant in the summer and people gather outdoors. She admits that Oregon's outdoor mask mandate is an extreme measure, but thinks it's necessary. There's a chance that Oregon's mask mandate proves to be an overreaction — unnecessary and at risk for burning people out so that they don't comply with even indoor mask mandates. Jeanne said he knows that people have pandemic restriction fatigue. But given the state's near-zero hospital capacity — and health care worker burnout — outdoor masking was a better alternative to shutting down businesses and events, he said. "My perspective," Jeanne said, "is that not taking action is just as much of a decision as taking action." Welcome to POLITICO Nightly. A note for next week: Nightly won't be publishing from Monday, Aug. 30-Monday, Sept. 6. We'll be back and better than ever Tuesday, Sept. 7. Reach out with news, tips and ideas for us at nightly@politico.com. Or contact tonight's author at rrayasam@politico.com and on Twitter at @RenuRayasam.
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