KQED-

California Gov. Gavin Newsom’s $1 billion order of face masks from a Chinese manufacturer has been denied certification by federal regulators, the Sacramento Bee reported Wednesday.

The N95 particulate-filtering masks California planned to buy from supplier BYD are being delayed while the company tries to secure safety certification.

A spokeswoman for the National Institute for Occupational Safety and Health (NIOSH), Katie Shahan, wrote, “NIOSH tested the received hardware; however, the review of the documentation provided to NIOSH for the design, manufacturing and quality inspection of the device was concerning,” the San Francisco Chronicle reported.

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