N95 masks are NIOSH-certified, while KN95s—which the CDC notes are the most widely available mask—are manufactured in China and meet standards specific to China.
Besides the N95 being made to meet US standards and the KN95 being made to meet Chinese standards, data obtained from the performance testing of both masks show that there is a lower pressure drop on inhalation and exhalation for the N95 facemask. This signifies that the N95 is slightly more breathable than the KN95 face mask.
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