Posted by Mark on Mar 21st 2020

N95 vs KN90


"In the U.S., respirators are approved by the United States National Institute for Occupational Safety and Health (NIOSH). NIOSH classifies particulate respirators into one of three main classes -- N (not resistant to oil), R (somewhat resistant to oil), and P (oil proof). NIOSH ratings are applied with particulate filtration efficiencies of 95%, 99%, and 99.97%; N95 respirators are commonly used to help reduce exposure from non-oily particulates, such as air pollution particulates."


"In the Chinese standard, particulate respirators are divided into two classes: KN and KP classes. KN class respirators only filter non-oily particles, such as dust, mist and microorganisms. Particulate air pollution is typically considered a non-oily particulate. KP class filter respirators can be used for both oily and non-oily particulates. China-approved respirators are also available with several filtration efficiencies: 90%, 95% and 99.97% efficiency. KN90 and KN95 respirators are commonly used to help reduce exposures to non-oily particulates such as air pollution particulates."

Please refer to the description from 3M: