来自MSN28 天
As wildfires burn in LA, what to know about protective masks
An N95 mask blocks against 95% of fine particles, while an N90 mask protects the user from 90% of pollutants. When possible, masks should be certified by the National Institute for Occupational ...
来自MSN1 个月
As wildfires burn in LA County, what to know about protective masks
An N95 mask blocks against 95% of fine particles, while an N90 mask protects the user from 90% of pollutants. When possible, masks should be certified by the National Institute for Occupational ...
WGN Radio1 个月
As wildfires burn in LA, what to know about protective masks
An N95 mask blocks against 95% of fine particles, while an N90 mask protects the user from 90% of pollutants. When possible, masks should be certified by the National Institute for Occupational Safety ...