Based on the tested particle transmission rate, there are three levels: P1 (FFP1), P2 (FFP2), P3 (FFP3).
Marka loo eego heerka gudbinta walxaha la tijaabiyey, waxaa loo qaybiyaa saddex heer: P1 (FFP1), P2 (FFP2), P3 (FFP3).