Masking the truth
Print Edition
Face masks that promise protection against the hazards of air pollution might not be as effective as they claim.
In recent tests, 23 of the 38 batches examined were found to be less effective at blocking particles than advertised, the Shanghai Quality and Technical Supervision Bureau said.
Masks made by Shanghai Dasheng, a sanitary products producer, on sale at a Metro supermarket in Putuo District were found to have no filtering effect at all, the bureau said.
Only slightly better were the masks produced by Ludun and sold on jd.com, which were found to have a filtering efficiency of just 10 percent. China’s quality standards on face masks cover only products designed for clinical or industrial use, and not those intended for personal use.
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