How to choose anti-fog and dust mask in foggy days?

Before telling you which mask to choose, let's first understand an indicator. The state has clear regulations on the performance and protection level of respiratory protective equipment. In addition, it can be divided into filtering non-oily filters (KN) and filtering oily and non-oily filters (KP) according to their performance. Please refer to the classification standard formulated by China:

Classification by protection level

KN series:

KN 100: For non-oily particles above 0.075 micron, the filtration efficiency is greater than 99.97%.

KN95: For non-oily particles with a diameter greater than 0.075 micron, the filtration efficiency is greater than 95%.

KN90: For non-oily particles above 0.075 micron, the filtration efficiency is more than 90%.

KP series:

KP 100: For oily particles above 0. 185 micron, the filtration efficiency is greater than 99.97%.

KP95: The filtration efficiency of oily particles above 0. 185 micron is more than 95%.

KP90: The filtration efficiency of oily particles above 0. 185 micron is more than 90%.

We can see that KN and KP define particles of 0.075 micron and 0. 185 micron. In order to keep smaller dust away from us, it is best to choose 95 masks (especially in areas like Xi 'an). Of course, friends who can't turn over money can choose 90, which is much better than not wearing it. However, it is difficult for general masks to have an ideal blocking effect on dust smaller than 0.05 micron.

Is it better to use a mask with a greater degree of filtration? No matter how good the filtering effect is, if it doesn't fit your face, it's also futile. Moreover, if you wear a mask for a while and want to take it off to catch your breath, you can only say that the hard-earned money spent on buying a mask is not as good as donating it to out-of-school children.

What kind of anti-fog mask is good? Is it enough to buy a KN95 mask for filtering non-oily dust? There are two kinds of dust, oily and non-oily. However, oily dust attached to non-woven fabrics will reduce the electrical properties and make fine dust penetrate. Therefore, the filter material to prevent oily dust should undergo special electrostatic treatment to achieve the purpose of preventing fine dust. If you ask us if we can generally get in touch with oily dust, automobile exhaust will give you the answer.