This standard is called Airlaid Paper Manufacturers protective equipment self-priming filter anti-particulate respirator', which is only suitable for filtering non-oily particulate matter, and can reach 90% or 95% of the filtration standard, but does not specify the diameter of the particulate matter. From the perspective of activated carbon alone, Wang Yan, a professor at the School of Environmental Science and Engineering at Shandong University, said: 'Activated carbon masks may have certain effects, but the use of activated carbon to prevent PM2. Mask, but it feels very general.'
On the Internet, PM2.' Experiment proves that medical masks such as N95 and N99 are indeed effective for preventing respiratory infectious diseases, while general cotton yarn masks only have dustproof effect.. For example, two widely-circulated experiments have drawn two diametrically opposite conclusions: one said that activated carbon had the best effect, and the other said that activated carbon masks were totally unreliable.
China Antibacterial Association expert Zhao Danqing once publicly stated that PM2. Outside a stall selling hats and scarves, there are many colorful cartoon masks lined up in a row, priced at 12 yuan each, and a sign stands next to the mask, which reads: Fashionable beautiful masks, PM2.
The filtration efficiency can indeed reach more than 95%.5. First, it is not easy to buy regular products, and second, N95 masks are not suitable for everyone.5' are hot. But regardless of whether it is an anti-particulate type, an anti-formaldehyde type, an anti-odor type or an activated carbon type, sellers advertise that the masks they sell have the special function of 'anti-fog'.3%, and that of ordinary disposable medical masks is 85.
The effect of most masks is limited. For example, cartoon masks that young people like, experts do not recommend wearing them.8 yuan has the highest sales volume, and the cumulative sales have only been sold in the last month. It is understood that 'N95' is the standard of the National Institute of Occupational Safety and Health.' Consumer Ms. 'It feels very limited. Li bought one for 35 yuan two months ago. The results show that: ordinary gauze masks are not blocked below PM5; medical surgical masks and medical disposable masks can block diameters greater than 4 microns For particles of 0.