NIOSH不是商标，是美国国家职业安全卫生研究所的缩写，

https://en.wikipedia.org/wiki/National_Institute_for_Occupational_Safety_and_Health

这个机构批准N95口罩

https://www.cdc.gov/niosh/npptl/topics/respirators/disp_part/n95list1-a.html#:~:text=The%20N95%20respirator%20is%20the,respirators%2C%20listed%20alphabetically%20by%20manufacturer.