也可以称为N95-certified masks，或masks rated N95。
95型口罩，是NIOSH(National Institute for Occupational Safety and Health，美国国家职业安全卫生研究所)认证的9种防颗粒物口罩中的一种。
A mask rated N95 filters out more than 95% of particles larger than 0.3 microns.
达到N95等级的口罩可以滤除超过95%的直径大于0.3微米的颗粒物。
N99的意思就是可以滤除99%的直径大于0.3微米的颗粒物。
耳戴式口罩 earloop mask
头戴式口罩 headband mask
耳带、头带 strap
可调节长短的耳/头带是adjustable strap。
例句：
Straps can go either around the head or just the ears, depending on the model.
依据口罩型号的不同，带子可以挂在耳朵上，也可以箍在头上。
折叠式 foldable
例句：
One of the great advantage for this model is to be foldable, so that you can always take one with you without it taking much space.
这个型号的口罩最大优点是可以折叠，有利于随身携带，而不占用太大空间。
可清洗 washable
例句：
The mask is washable many times with no loss of filtration effectiveness.
这款口罩可以多次清洗，且不会损失过滤效果。
滤芯 filters
可更换滤芯是replaceable filter。
例句：
The replaceable filter is a bit difficult to switch out, but it’s not a serious problem.
可更换滤芯换起来有些困难，不过问题不大。
随弃式 disposable
例句：
Check out a variety of disposable respirators that help provide protection from particles, germs & gases.
快来看看各种款式的随弃式防护口罩，它们可以抵抗颗粒物、细菌和毒气。
一次性的 one-time-use
例句：
Do one-time-use masks actually help to protect you?
一次性口罩真的能起防护作用吗?
可调节金属鼻夹 metal nose clip
这个表述比较灵活，还可以说成metal nose bar、metal nose band、metal nose bridge等。
例句：
This mask has a metal nose clip with soft foam nose cushion for an easy and comfortable fit.
这款口罩带有金属鼻夹和柔软海绵垫，很容易贴合且很舒适。
呼吸阀
exhaust valve / exhalation valve
例句：
This model comes with an exhaust valve, which offers improved comfort, especially for those having difficulty to breath comfortably while wearing the masks.
这个型号的口罩带有呼吸阀，佩戴起来更舒适，对于那些戴着口罩呼吸不畅的人来说尤其如此。
