KN95 Mask are the Chinese version of N95. They are regulated by the Chinese authorities. N95 is regulated by the U.S. based National Institute for Occupational Safety and Health (NIOSH) and the Food and Drug Administration (FDA).
On April 3, “in response to continued respirator shortages,” the FDA website states, it issued a new Emergency Use Authorization (EUA) for non–NIOSH-approved N95 respirators made in China—including KN95s—so long as “certain criteria are met, including evidence demonstrating that the respirator meets certain standards.”
Source: Vice