The CDC still recommends outdoor masking for unvaccinated (or partially vaccinated) individuals—and for fully vaccinated people at large outdoor gatherings such as sports events or concerts—until widespread vaccination is achieved. The new guidance acknowledges something many experts on airborne virus transmission have been saying for months: the risk of getting COVID is a lot lower outdoors than indoors. According to Marr, outdoor masking among vaccinated people is still important in certain situations, such as standing in a big line or attending a sporting event. So if you are outdoors, you should either keep some distance from other people or wear a mask. This applies to both unvaccinated and partially vaccinated individuals and to anyone who is fully vaccinated but in a vulnerable group.