Are disposable medical masks resistant to PM2.5?

Not prevent PM2.5, medical masks are gauze, so small particles can't come in. 1. Green shield pm2.5 masks are truly PM2.5-resistant masks on the market. The highlight of the mask is that in addition to being able to truly prevent PM2.5, the fabric is made of Kanglun fiber that can kill super bacteria. Therefore, it has the functions of preventing dust and bacteria. There are various types such as retail households. 2. (N95) Mask: Compliant with the United States. Occupational Safety and Health Association Standard (NIOSH) N95 approved, the particle size of the filter can be as small as 0.3 microns in diameter. In the test, it blocked particles with a diameter of 0.075 microns, and the success rate was 95%. The diameter of the coronavirus pneumonia (SARS) virus is about 0.1 to 0.12 microns. 3. Surgical mask: It is made of three layers of "non-woven", suitable for use in the operating room environment; it can block particles with a diameter of about 4 microns or more. 4. Activated carbon medical mask: The added activated carbon material is mainly used to isolate the smell, not to prevent bacteria and viruses, and the respiratory resistance will increase, and the bacteria isolation function will be 98%. 5. Dust-proof mask: Mainly dust-proof, anti-bacterial function is general. 6. Ordinary paper masks: useful for blocking large particles, viruses less than 5 microns in diameter, can pass easily, and have limited bacterial isolation.