TABLE 2.
Respirator filtration efficiency according to the American and European classifications
| Type of mask | Filtration efficiency % |
| American classification system | |
| N95 | ≥95 |
| N99 | ≥99 |
| European classification system | |
| FFP1 | ≥80 |
| FFP2 | ≥94 |
| FFP3 | ≥99 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.