Working in a dusty environment, for your health, it is recommended to do a good job of respiratory protection. Scientific selection of dust masks, choose a good mask with good protection, smooth breathing and economical use. Help prevent lung injuries from occurring. The way to clear dust: masks must now implement the GB2626-2006 standard. The level of dust masks is divided into three levels: KN100, KN95 and KN90. Among them, KN100 can achieve nearly 100% (more than 99.97%) protection against ultra-fine dust. For large particles, you can choose KN95 rating. The protective effect of dust masks depends on 2 aspects. One is the filtration efficiency of the filter cotton. The second is the tightness of the mask combined with the face. Therefore, the mask must be divided into sizes, not divided into sizes of masks and facial fit effect varies from person to person. The way to clear the dust: scientific selection of dust masks certified by the GB2626-2006 standard helps to prevent lung injuries from occurring. 1, choose the compound half-face mask type. Disposable masks are not suitable for long-term or occupational protection due to high air leakage rate. 2. Choose KN100 rated dust filter cotton for use. Low protection rate will lead to physical harm. 3, choose silicone material is more comfortable. Suitable for long time wearing, not easy to trigger allergic reactions. Hardness of the mask is easy to cause facial indentation. 4, the mask is divided into size, this is extremely important. Do not buy those so-called universal models of masks. Easy to leak. 5, masks cover the mouth and nose, cover the mouth and nose, jaw 2 kinds, it is recommended to use the latter, relatively more comfortable. 6, it is recommended to choose a smooth breathing mask. Some masks are designed with double filter cotton, while the filter cotton has a double-sided, so the mask is relatively smooth breathing. At present, our country has KN100 grade products, and comprehensive use of the cost of about one dollar a day.