CDC recommends Upper-Room Ultraviolet Germicidal Irradiation (UVGI)

Updated Apr. 9, 2021

CDC recommends a layered strategy to reduce exposures to SARS-CoV-2, the virus that causes COVID-19. A layered strategy combines multiple prevention strategies such as consistent and correct use of masks, ventilation, physical distancing, cleaning and disinfection, and hand hygiene.

Ventilation interventions can help reduce the number of infectious viral particles (e.g., SARS-CoV-2) in the air. Ventilation interventions include opening windows, using fans, adding high-efficiency particulate air (HEPA) fan/filter systems, and adding upper-room ultraviolet germicidal irradiation (UVGI). This factsheet presents information on upper-room UVGI, which can be effective at reducing exposures to SARS-CoV-2 in some group settings.