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Respirator User Notices Issued by NIOSH

User Notice – Notices are provided to inform users of a condition or risk that may exist with a NIOSH-approved respirator.

NIOSH has reviewed and concurs with the facts in the user notice as of the date indicated on the NIOSH website.

For the most current notices, see the Conformity Assessment Notices and Letters to Manufacturers and Interested Parties web page.

Disclaimer: Links to non-Federal organizations do not constitute an endorsement of these organizations, their products, or programs by NIOSH and none should be inferred. NIOSH is not responsible for the content of the individual organization web pages found at these links. They are provided solely as a service to our users. A NIOSH certificate of approval is not an endorsement of the respirator by NIOSH. Such endorsements are not to be stated or implied by manufacturers in advertisements or other publicity. NIOSH certification represents that the equipment has met the requirements of Title 42, Code of Federal Regulations (CFR) Part 84.

Voluntary Rescissions of Respirator Certificates of Approval as requested by Manufacturer

With all rescissions, the approval number is no longer listed in the Certified Equipment List (CEL), or on any of the NIOSH web pages that list approved respirators.

Archive of Revocations, Voluntary Rescissions, Misleading Representation, and Stop Sale Notices Issued

Counterfeit Respirators / Misrepresentation of NIOSH-Approval

When NIOSH becomes aware of counterfeit respirators or those misrepresenting NIOSH approval on the market, we will post them to alert users, purchasers, and manufacturers. View Counterfeit Respirators / Misrepresentations.

Always verify that the brand of respirator is listed either in NIOSH’s list of manufacturers or as a private label company.

The NIOSH publication 2013-138 “Respirator Awareness: Your Health May Depend on It” provides additional information to look for when verifying your respirator is truly NIOSH-approved.


Check the respirator approval markings (graphic below) or the Certified Equipment List to verify your respirator is NIOSH-approved. Additional information is available on the NIOSH Trusted Source page.

Example of the Correct Exterior Markings on a NIOSH-Approved Filtering Facepiece Respirator

Sample of a generic filtering facepiece respirator with appropriate markings.