It is recommended to choose 3M masks, such as 3M 8246 and 3M 904 1, 3M 3200 dust-proof combination, 6200 gas-proof and dust-proof masks, etc. These masks are relatively good in smell or dust prevention. A good filter material for protective mask should meet the following three conditions: first, the filter efficiency is high when the mask is in good contact with the user's face; Second, the respiratory resistance is low; Third, users feel comfortable. If necessary, you can enter the blue sky labor insurance search picture introduction and explanation, I hope it will help you!