Table 1.

Respirator filtration efficiency according to the American and European Classification

Type of mask	Filtration efficiency (%)
American classification system
N-95	≥95
N 99	≥99
European classification system
FFP 1	≥80
FFP 2	≥94
FFP 3	≥99

Source: Handbook of Respiratory Protection by Craig E. Colton. FFP: Filtering facepiece