FDA Approved the usage of KN95
The FDA approved that "KN95s, can be used in the US during the COVID-19 pandemic. The short answer is yes. In response to continued respirator shortages, the FDA also issued a new Emergency Use Authorization (EUA) for non-NIOSH-approved respirators made in China, which makes KN95 respirators eligible for authorization if certain criteria are met, including evidence demonstrating that the respirator is authentic. Lastly, the FDA revised an immediately in effect guidance to help expand the availability of general use face masks for the general public and respirators (including N95 and KN95) for health care professionals during this pandemic."