Expired masks should not be used. The role of the mask is to filter the air that enters the mouth and nose, in order to block harmful gases, viruses, bacteria, etc. from entering the mouth and nose, and then entering the lungs. Expired masks have impaired filtration and poor fit, and cannot filter bacteria and viruses, thus failing to prevent disease.
Expired masks are unable to isolate dust mites, pollen and irritating chemical gases such as sulfur dioxide and oil smoke floating in the air. When people inhale these substances, it is easy to irritate the airways, coughing and coughing up phlegm. It may induce acute attacks in patients with bronchial asthma, with symptoms such as wheezing, shortness of breath, chest tightness, and even significant breathing difficulties.
Expired mask filtration is impaired, the wearer is also more likely to come into contact with the air discharged viruses, bacteria and other pathogens, so that the airway mucosa congestion, edema, as well as inflammatory secretions oozing out, which can lead to bronchitis, pneumonia, lung abscess, and even infected with influenza, the new coronaviral pneumonia and other diseases, which will have an impact on the organism.
It is recommended that people do not stock up too many masks, and pay attention to check the expiry date and mark them well to prevent wearing expired masks by mistake. If you feel unwell, please consult a doctor for examination and treatment.