"The National Institute for Occupational Safety and Health (NIOSH) has identified many filters being sold on well-known online marketplaces claiming to be P100® filters that are not part of a NIOSH Approved® respirator configuration. Examples and more information can be found on the NIOSH Counterfeit Respirators/Misrepresentation of NIOSH Approval webpage under Counterfeit or Misrepresented Respirator Examples.
P100 and NIOSH Approved are certification marks of the U.S. Department of Health and Human Services (HHS) registered in the United States and several international jurisdictions."
Above is a CDC - NIOSH email sent out yesterday, January 31st. More info can be found at: