N series is American standard
KN series is Chinese standard
FFP series is a European standard
The higher the number, the higher the protection level
It is easier to understand with a formula:
The number with a V at the end indicates that there is a valve.
All 95 starts with the N95 series
The 90 series is also okay. The 90 series does not have a high protection level of 95, but it can also resist more than 90%, which is much better than ordinary masks.
Under normal circumstances, used to resist viruses and influenza, N95 series is sufficient.
Ear strap masks are easy to take off, suitable for friends wearing glasses, but the head effect is better with a closed effect.
I hope everyone can treat it rationally, prevent it scientifically, and believe in the coping ability of the state, government, and medical and disease control personnel.