Wearing a protective mask can prevent respiratory infections effectively.By investigating the quality of daily protective masks which are designed by different standards and at different prices,useful recommendations can be provided for choosing masks.Thirty daily protective masks are tested in usability,filtration efficiency,chemical properties according to the same test standard.The results show that 16.7％samples of head harness and 13.3％samples of pH do not meet the standard requirements,30 samples of bacterial filtration efficiency,particle filtration efficiency,formaldehyde content,banned azo colourants,microorganism meet the standard requirements.The performance of children masks better than adult masks,different kinds of masks have excellent filtration efficiency,the dyed samples are not found banned azo colourants,there is no necessary relations between price and results for thirty samples,buying mask products in stores is more expensive than online.
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