From the perspective of color, the darker side is generally the front of the mask, that is, the side facing outwards when wearing it.
Also known as N95 respirator, a kind of respiratory protective equipment, which can effectively filter particles in the air, and is suitable for protecting respiratory diseases transmitted through the air.
The “Guidelines for Wearing Masks in the Public Science” have clearly stated that disposable medical masks and medical surgical masks are limited-use, with a total of no more than 8 hours. Occupational exposure (doctors, testing personnel, etc.) personnel use masks for no more than 4 hours, and cannot be reused. So what are the hazards of wearing a mask for a long time?
Wu Haojie, a nurse in the emergency department of the Chongqing Emergency Medical Center, said that many citizens have recently reported that wearing a mask for a long time causes breathlessness, which can be relieved by abdominal breathing.
Different standards and certification requirements apply to medical masks in different countries/regions.
Since medical masks are registered or controlled according to medical devices in most countries or regions, consumers can further distinguish through relevant registration control information. The following takes three countries and regions in China, the United States and Europe as examples for analysis.
