BodyGuard n99 pm2. 5 Anti-pollution face mask with activated carbon and 6 layers filtration is designed to help provide quality, reliable respiratory protection. The mask has activated carbon to filter impurities of air and uses a variety of features to meet your respiratory protection and comfort needs. The breathing valve helps in better exhalation. Use BodyGuard anti-pollution face mask for protection against dust, odour, pollen, toxins and pm2. 5 Particles.