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When it comes to N95 mask anti haze and dust prevention, let's first understand haze and PM2.5, haze = PM2.5? Haze is mainly composed of sulfur dioxide, nitrogen oxides and inhalable particles. The inhalable particulate matter is what we often call PM. PM2.5, as we often say, is pollutant particles with a diameter less than or equal to 2.5 microns.
What are the hazards of PM2.5? PM50 and PM10 can only reach our nasal cavity and throat respectively, and they will be further advanced by ciliary tissue. PM2.5 and particles smaller than PM2.5 can reach alveoli directly and enter the whole blood circulation system. Imagine a pile of foreign bodies, which are not hygienic in themselves, enter our bodies directly and circulate in our bodies. They can not only directly damage our respiratory system and cardiovascular system, but also easily attach toxic and harmful substances into the human body, which significantly increases the probability of carcinogenesis, teratogenesis and mutation. So we must choose a N95 mask to prevent haze and dust.
Search for "N95 mask to prevent haze and dust" on taobao.com, and the prices of hundreds of varieties vary. Here we must explain how the dust mask works against PM2.5. In terms of image, although PM2.5 is small, if we can cover the mouth and nose with a dense net, the mesh is smaller than 2.5 microns, then PM2.5 will not be isolated from the body? We want to "N95 mask anti haze" is a super excellent filter. So the key to the mask's function is its physical filtering mechanism. It is quite unreliable to say that some filter element of dust mask can absorb PM2.5 or eliminate PM2.5 by chemical means. The key point depends on the anti haze mask material. Only professional and tested materials can filter PM2.5.
Can the anti haze mask made of cotton fabric prevent PM2.5?
A cotton mask with enough layers can filter a considerable part of dust and bacteria. However, the air in the city can inhale particulate matter and fine particles, the filtration rate of cotton masks is less than 30%. The principle of this fiber mask is a mechanical barrier. Through this layer by layer mechanical barrier, large particles can be blocked, but particles less than 5 microns in diameter cannot be blocked.
N95 mask to prevent haze and dust
Can medical masks prevent PM2.5
The disposable mask used by surgeons is made of non-woven fabric, which is divided into three layers. The outer layer is designed with anti droplet, the middle layer is filtered and the inner layer is moisture absorption. The mask is mainly used to protect doctors from droplets and splashes, and its particulate matter filtration rate is only more than 30%. What's important is that the edges of these masks don't fit the face shape and can only serve as a general shelter.
What is the activated carbon mask for? Is it better than non activated carbon respirator in protecting particulate matter?
Adding a thin layer of activated carbon or other gas absorbing materials on the particulate matter protective mask can reduce some odorous gases with low concentration, that is to say, reduce the odor. For example, the odor of putrid substances (mainly organic substances). When the concentration of odor gas is too high to be harmful to health, it is necessary to use an anti-virus mask.
Activated carbon only increased the elimination of some odor. There is no difference in the performance of particulate matter protection with or without carbon. The activated carbon mask which can reduce the odor does not increase the protection of particulate matter.
What is it that people often say about N95 mask to prevent haze and dust?
N95 mask has become a favorite in the market since the SARS period. N95 is not a specific product name. It is a kind of mask classification in the United States standard, that is, "the efficiency of filtering non oily particles is more than 95% in NIOSH standard of the United States", and is approved by NIOSH (National Institute of occupational safety and health).
Generally speaking, the higher the filtration efficiency, the better the protective effect, but at the same time, the greater the respiratory resistance. Therefore, N95 is a good balance between protection and comfort, so it is suitable for most people.
Even N95 masks of the same brand have different standards in different countries. For example, 3M's 9001 and 9002 are made in China by 3M, which are not sold in the U.S. market. Instead, the national standard gb2626-2006 is implemented for 3M's 9210, which implements the N95 standard of NIOSH in the United States. Therefore, when purchasing, you should pay attention to the instructions on the package of anti haze mask to judge which anti haze mask standard its material is.
