Effective immediately, to comply with an order by the Alameda County Health Department, you must wear a face cover when working in or walking through common areas of the Lab such as hallways, stairways, and elevators. Exceptions include if you are alone in a personal office or alone in a vehicle. https://stratcomm-elements.lbl.gov/2020/04/21/use-of-face-covers-at-the-lab/