Researchers from 32 countries are urging the World Health Organization to change its recommendations on coronavirus, saying that smaller respiratory particles can linger in the air and infect people. The group—made up of 239 scientists—plan to publish their letter in a scientific journal this week, according to The New York Times. WHOs current guidance claims the virus is primarily spread by large airborne droplets that are typically the result of a cough or a sneeze. 

The findings are significant, especially for anyone entering a facility or returning to an office that does not have adequate ventilation. According to experts, businesses may need to minimize how their air is recirculated while also adding powerful new filters. In addition, ultraviolet lights may be needed to kill viral particles floating in tiny droplets indoors.

Many experts agree that coronavirus seems to be most infectious when people were in prolonged contact at close range, especially indoors wher aerosol transmission is most prominent.