Closing businesses during the COVID-19 pandemic has had devastating consequences for individuals and the economy in general. Proper air handling combined with the use of masks and physical distancing can greatly improve the safety of indoor spaces. Joseph Allen, DSc, MPH, assistant professor of exposure assessment science at Harvard T.H. Chan School of Public Health, and Andrew Ibrahim, MD, assistant professor of surgery and architecture and urban planning at the University of Michigan, discuss air conditioning standards that can substantially reduce the risk of disease transmission in indoor spaces. Related Article(s): Turbulent Gas Clouds and Respiratory Pathogen Emissions