谢谢分享。查了一下，ASTM是美国标准，EN14683 是欧洲标准，都是分成3级。链接在里面

https://www.mascotworkwear.com/en/en-14683

https://www.coronavirus.kdheks.gov/DocumentCenter/View/1416/Understanding-ASTM-Levels-for-Facemasks-PDF---7-30-20