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To make indoor communal spaces safer, experts keep stressing, they need to be "well-ventilated." But what does that mean? In conversations with several air quality experts and engineers, ventilation seems to be simple in concept and potentially fraught in execution. "It's a huge engineering problem," Shelly Miller, an environmental engineer at the University of Colorado Boulder, says. "We don't have the systems in place for many buildings to be operated appropriately during a pandemic."
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