⚠️~3x the #COVID19 Positivity % for 2021 versus 2020 as schools are about to reopen in New York City. Even among teenagers, positivity is not lower than younger children. NYC schools have mask mandates—but need more ventilation & air disinfection too.

Figure by @eduwonkette_jen pic.twitter.com/bg0paVFvZE

— Eric Feigl-Ding (@DrEricDing) August 28, 2021