As of August 13, 2021, any Shanghai Dasheng Health Products Manufacture Co., Ltd. respirator with a NIOSH approval label containing a revoked approval number is no longer NIOSH-approved and cannot be manufactured, assembled, sold, or distributed.
See the link below to find the approval numbers of the respirators that have been de-certified. The approval number starts with TC-84A. If you can’t find this number on the respirator or its packaging, it was never NIOSH approved in the first place and shouldn’t be used, but if it has any of the listed TC numbers in the link below on the respirator itself or its packaging, you should discontinue use immediately and remove from use any that have been distributed.
https://www.cdc.gov/niosh/npptl/resources/pressrel/letters/respprotect/CA-2021-1038.html