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We have recently completed an observational study of 10,211 pedestrians in several regions across Hong Kong between 1 st 29 th Feb 2020 and would like to make a preliminary report for rapid dissemination. In our study, 94·8% (n = 9683) wore masks of which 83·7% wore disposable surgical masks.However, 13·0% wore them incorrectly; with 35·5% worn inside-out or upside-down; and Buy PM2.5 Masks - A mask PM2.5 has a wide variety of uses in different industries. Use it for construction or factory work to protect against various particles that end up in the air. A PM2.5 face mask also provides safety from smoke and fumes and is ideal to wear around accident sites. Some versions are designed to filter out microbes such as viruses and bacteria. China's face mask industry under scrutiny as pollution Mar 25, 2014 · The masks were not effective against PM2.5 particles, the CCTV report said. Jiang Xiubin, who owns the BinHai Face Mask factory and who is head of the Dadian face mask
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