口罩的分類
http://www.cdc.gov/niosh/tb.html#toc
N95的定義
NIOSH以直徑0.3微米的NaCl結晶顆粒測試
當口罩可以過濾95%的NaCl...稱為N95
0.3微米是Mycobecteria tuberculosis過濾孔徑....
已經看過無數人亂講N95的定義了...
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