Speaking of N95 masks for preventing smog and dust, let us first understand smog and PM2.5. Does smog=PM2.5? The main compone
2021-08-20
According to general practitioners in the United States, it has been medically confirmed that small particles smaller than 2.
2021-08-20
Correct use of disposable sanitary masks:How to wear a mask1. The mask has two sides, white and blue, with the white side fac
2021-08-20
Masks generally refer to appliances worn on the mouth and nose to filter the air in the entrance and exit nose to prevent har
2021-08-20
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