It is applicable to the environment where are lots of powder dust and mist produced by mechanical force in handling coal, iron ore and quartz mineral or processing cotton, wheat flour and other materials, with the occupational exposure limits of 10 times and the concentration of dust and mist below the limit specified by local laws and regulations. It is especially applicable to preventing respiratory disease caused by haze, PM2.5 powder dust. Standard comparison table: Filtering effect CHINA USA EUROP ≥90% KN90 KP90 --   ≥95% KN95 KP95 N95 P95 FFP2 ≥99% -- N99 P99 FFP3 ≥99.97% KN100 KP100 N100 P100 -- KN:Suitable for filtering non-oil particles,such as coal dust, cement dust, acid fog, paint fog. KP:Suitable for filtering oily and non-oily particles, Such as soot, asphalt smoke, coke oven smoke, diesel exhaust particles.