Should masks be worn outdoors?

Affiliations

• ¹ Division of Experimental Medicine, University of California, San Francisco, USA babak.javid@ucsf.edu mc349@st-andrews.ac.uk.
• ² Department of Neonatology, University Hospital Zurich and University of Zurich, Switzerland.
• ³ Division of Infection and Global Health Research, School of Medicine, University of St Andrews, UK babak.javid@ucsf.edu mc349@st-andrews.ac.uk.
• ⁴ School of Information and Department of Sociology, University of North Carolina at Chapel Hill, NC, USA.
• ⁵ Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore, MD, USA.