In partnership with the U.S. Environmental Protection Agency, scientists from the North Carolina School of Medicine studied the levels of protection offered by several types of face mask, from medical masks to consumer-grade masks and improvised face coverings.
They assessed the protection that each mask offers to its wearer when exposed to others who may be infected. To achieve this, they used a method based on the Occupational Safety and Health Administration (OSHA) Fit Test to determine the fitted filtration efficiency of the masks.
In total, 12 types of facial protection were tested, worn by an adult male who made a series of repeated movements of the torso, head and facial…
Keep on reading: What’s the best type of mask for COVID-19 protection? Scientists investigate