Can anyone use N95 masks?

No, elderly people, children, patients with heart and lung diseases, and other frail people need to use N95 and above masks carefully, and follow the doctor's advice if necessary. If you are unsure about your physical condition or the pros and cons of wearing a mask, consult your doctor.

Except for some high-end models used in harsh environments, masks generally do not have oxygen supply, but instead increase the resistance to breathing to varying degrees. The wearer needs to spend more force to drive the respiratory muscles to achieve gas exchange. For the young and old with weak respiratory muscles or poor cardiopulmonary function, this additional consumption may be quite large, the respiratory muscles are fatigued, and the ventilation is blocked The harm caused by oxygen may exceed the risks brought by the particulate matter itself, so these people need to be careful about whether or not to wear a mask.