Los Angeles Times-
There’s a certain kind of N95 mask that’s actually bad to wear for public health during the coronavirus pandemic.
San Francisco’s health officer warns that N95 masks with a vent on them actually cause a person’s germs to spread, rather than containing them close to the wearer’s face.
The warning is in the San Francisco health order, which says that any mask with a one-way valve — designed to facilitate easy exhaling — “allows droplets to be released from the mask, putting others nearby at risk.”
The California Right 