First of all, in foggy weather, it is best for the elderly and children to reduce outdoor activities and wear protective masks if they must go out. The choice of children's protective masks is very important, mainly as follows:

1. Protective performance, ordinary medical masks and cotton masks can prevent germs, but forget about smog. It's best to use special anti-fog masks

2. Air permeability is a very important indicator. Masks protect our health and don't become killers who endanger our families. At present, many masks on the market only pursue protection and ignore air permeability. Because the national standard only stipulates the protection and no air permeability, the main protective masks on the market at present, such as 3M and Honeywell, are all industrial masks with first-class protection performance, but I can only be happy with the air permeability and comfort. Otherwise, the labor laws in Europe and America will not generally stipulate that such masks should not be worn for more than 4 minutes, and it is clearly stated that they are not suitable for children, but there is no similar explanation in domestic packaging. I had been worried for a long time before, and then I searched for a mask with perfect balance of protection and air passage. Now my son is wearing this kind of Puweixin. The American version of the mask called CROSSTEX I bought before is medical, with a dust filtration rate of 99.8% and an air passage rate of 42Pa(3M92 14Pa, domestic green shield and so on are generally above 2Pa, but it takes 8Pa to wear for a long time). Puweixin is the China version of CROSSTEX. Although it is a China version, it is also imported from the United States, only with different trademarks and similar prices. However, CROSSTEX has no agents in China, so it is more reliable to choose Puweixin, because it uses secure fit technology to fit all faces, so children's faces can also fit. If it doesn't fit, even the best protection is useless. Puweixin is slightly expensive, almost 3 yuan on tianmao.