What is the pm2.5 filter installed in BMW's accelerator?

It should filter out harmful substances. Now the pollution is too serious and the smog is too heavy, so protect yourself. We'd better wear masks when we go out. Puweixin imported from the United States meets the highest standards of medical masks in the United States, and has good filterability, preventing both particles and droplets. The filtration efficiency is 99.8% for particles as small as 0. 1 micron, and 99.9% for bacteria or virus carriers as small as 0.3 micron (common in droplets). SecureFit patented technology is adopted to adapt to different face shapes and achieve a high degree of fit. At the same time, the six-point support disperses the pressure, and there is no ligature mark on the face, which is very comfortable to wear. Hundreds of times in Beijing, the United States wanted to wear Dong. I wish you a happy day.