Precautions when buying anti-smoke masks

When we buy anti-smoke masks, we must buy them through regular channels; we can choose masks with corresponding protection levels according to different levels of air pollution; when we first choose masks, we need to try them on in accordance with the instructions for use of the product. Fitting product; if you feel the respiratory resistance increases obviously during use, it is recommended to replace the mask. Not everyone is suitable for wearing masks, such as those with weak cardiopulmonary function should wear masks with caution. The protective effect will not be achieved if the mask is used improperly. Before use, check for leaks.