Wear masks scientifically
It is an effective measure to prevent respiratory diseases
How often do I need to change my mask?
N95 and general surgical masks
Is there a difference in the frequency of replacement?
Recently, there has been a lot of cooling and snowfall
Wear a cotton mask
Is it effective in protecting against respiratory infections?
Let's take a look
Answers from experts from the Chinese Center for Disease Control and Prevention
Source: Shanxi Daily New Media