Speaking of KN95 masks against smog and dust, let us first understand smog and PM2.5. Is smog = PM2.5?
The main components of smog are sulfur dioxide, nitrogen oxides and respirable particulate matter. The inhalable particulate matter is PM (particulatematter) which we often say. PM2.5, which we often say, is pollutant particles with a diameter of 2.5 microns or less.
What harm is PM2.5? As both inhalable particles, PM50 and PM10 can only reach our nasal cavity and throat, respectively, and will be further advanced by ciliary tissue. PM2.5 and particulate matter smaller than PM2.5 can directly reach the alveoli and enter the entire blood circulation system. Imagine a pile of foreign objects that are unhygienic in nature, directly enter our body and circulate in the body. Not only can they directly harm our respiratory and cardiovascular systems, but they are also liable to attach toxic and harmful substances into the human body, which significantly increases the risk of carcinogenesis, teratogenesis and mutation. Therefore, a KN95 mask must be selected to prevent fog and dust.
Search for "KN95 mask anti-fog, haze and dust" on Taobao. The price of hundreds of varieties is different. Here we must first explain how dust masks fight PM2.5. In terms of image, although PM2.5 is small, if we can cover a dense net on the nose and mouth, and the mesh is smaller than 2.5 microns, then PM2.5 is not isolated from the body? The "KN95 mask anti-fog and haze" we want is a super excellent filter. So the key to the function of the mask is its physical filtering mechanism. Anyone who says that a filter element of a dust respirator can adsorb PM2.5 or can eliminate PM2.5 by chemical means is quite unreliable. The focus depends on the anti-smoke mask material. Only professional materials that pass the test can filter PM2.5.
