Effective immediately, unfiltered cloth face covers alone will no longer be allowed at Lab sites. You must wear a surgical mask, a KN95 or KF94 mask, an N95 respirator, or a filtered cloth face cover. Free surgical masks are available at the Blackberry and Strawberry gates. https://ehs.lbl.gov/2022/01/25/new-on-site-requirement-for-face-covers/