In fact, N95 is just standard of face masks in USA based on NISOH request. “N” means Not resistant to oil, and “95” means the filtration efficiency is 95% or above. In addition to 95, there are classifications of N99 (the filtration efficiency is not less than 99%) and N100 (the filtration efficiency is not less than 99.97%)
ONLY the face masks meet the N95 standard and approved by NIOSH, then they can call N95 masks. N95 mask can filter 95% of non-oily particles with a diameter of 0.3 micrometers or more in the air. China manufacturer also can get the NISOH approval as long as the masks can meet the NISOH requests.
In fact, there are other series standards: R series and P series. “R” means Somewhat resistant to oil, and “P” means Strongly resistant to oil / Oil-proof. Both R95 and P95 masks can filter 95% of non-oily particles and oily particles with a diameter of 0.3 micrometers or more in the air. The service life of R95 masks is up to 8 hours in an oily particulate environment, while the service life of P95 masks can be up to 40 hours. Or 30 days. R series and P series masks also have R99 / R100 and P99 / P100 classification.
For most people who are not working in the medical field, wearing N95 masks is basically enough to prevent the most harmful particles, bacteria, and viruses.
Although the world in which humans live faces many bacteria and viruses, as long as we do good personal protection and pay more attention to wearing N95 masks in places where there are many people, we can prevent many diseases through the respiratory system.