Along with vaccines, masks, and testing, indoor air hygiene and building engineering controls will be key to slowing the spread of airborne, highly infectious variants of COVID-19. In a recent review in the journal Indoor Air, researchers at Berkeley Lab presented a thorough review of the state of the science for several key strategies to reduce airborne infection risk using building controls – ventilation, filtration, airflow management and disinfection by germicidal ultraviolet (UV) light.