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NIOSH air filtration rating
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NIOSH air filtration rating : ウィキペディア英語版
NIOSH air filtration rating
NIOSH air filtration rating refers to the publications of National Institute for Occupational Safety and Health (NIOSH) of US government pertaining to respirators and masks worn to filter contaminated air, regardless of cause.
==Plain surgical mask==
Plain surgical masks do not carry a NIOSH rating. Recommended to prevent seasonal flu and filter out larger particulate matter, but not proven to be effective. Will filter out larger particles if worn tightly. World Health Organization, Society for Healthcare Epidemiology of America, the Infectious Diseases Society of America, the Association for Professionals in Infection Control and Epidemiology, and the American College of Occupational and Environmental Medicine still recommend these except in cases of "high risk".〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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