Experts back move to reopen parks. Some cities think it’s still too early.

“If your only goal is to minimize the number of coronavirus cases, which means minimizing deaths, then 15 months would be the amount of time needed for a lockdown,” said Andrew Noymer, associate professor of public health at University of California Irvine. “People aren’t going to do that. … We have to start easing some of the social-distancing rules, or they will start to break down.”