We are a noteworthy manufacturer of Yellow Dust Masks in the market. When used properly, they prevent the inhalation of dust in the air and protect the lungs. When you inhale, air is pulled through the dust mask and dust is captured on the outside of the mask. Yellow Dust Masks will leak if they don't fit your face properly. They don't filter out chemical vapors. We have a team of quality controllers who test these masks on variegated parameters before dispatching.