Medical masks are generally classified into several types

1. General medical masks

Advantages: can block or protect pathogenic microorganisms other than particles or aerosols, such as pollen, etc.

Disadvantages: can not reach the filtration efficiency of particles and bacteria, can not effectively prevent the pathogen through the respiratory tract invasion, also can not play a protective role on particles and bacteria virus.

2. Medical surgical mask

Advantages: similar to the medical disposable mask in appearance, it should meet the standard of YY0469-2004 "Technical Requirements for Medical Surgical Mask" : it has a certain respiratory protective performance, can block most bacteria and some viruses, and the filtration efficiency of bacteria can reach more than 95%, which can reduce the risk of cross-infection to a certain extent.

Disadvantages: better at blocking pathogens than common medical masks, but slightly worse than medical masks.

3. Medical protective masks

Advantages: can filter the particles in the air, block droplets, blood, body fluids, secretions droplets, can prevent most bacteria, viruses and other pathogens, can effectively prevent the virus infection in the air.

Summary: It can be used in public places, crowded places, hospitals, offices and other closed Spaces to protect against airborne respiratory infectious diseases.

4. N95 mask

Advantages: Mask can effectively filter PM2.5 particles. Mask is airtight and can block the invisible killers in the air -- haze, virus, bacteria, dust mites, pollen and other tiny particles.

Conclusion: It is suitable for haze weather or more professional places, but due to its strong airtight, bad wearing may lead to breathing difficulties, and patients with cardiovascular diseases should be carefully selected.