Under the existing circumstances, we ordinary people should do our own protection and wear professional anti-fog equipment! Now everyone is saying that masks can't prevent smog, mainly because of its leakage rate, so everyone must choose good sealing and filtering. Didn't CCTV's Health Road program report on the choice of smog masks? The air purifier can be used for the nose of the smog star. I hope you can adopt and breathe together. * * * Fate!