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And part of the mask airflow resistance is very large, will cause people when wearing breathing difficulties . Such masks are often in some

Jewelry store selling , low price, contain synthetic ingredients , health worrying. There does not have gauze masks

Effective dust effect, can not use a dust mask , gauze mask filter efficiency tested less than 30 %. The thicker

Breathable masks worse , if not pay attention to the use of health , but also lead to bacteria. Particulate protection

Increase on a thin layer of activated carbon masks , increasing the role of deduction for certain odor , but the anti- particles

Enhanced efficiency and no significant protection . Meanwhile, the activated carbon itself is a particulate , it may be worn by inhalation, for

Patients suffering from chronic respiratory or infirm , it instead is a hazard. Disposable masks major

Exhaled air filter for preventing infection between doctors and patients . After 

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