The 3M Particle Protection Mask, commonly known as the 3M dust mask, falls under the category of occupational health as it is used to protect workers' health. Its purpose is to prevent the inhalation of harmful particulate matter present in the air, ranging from coarse sand and fugitive dust to fine dust, smoke, manufacturing process emissions, air pollutants like PM2.5, and even pathogens. The masks come in different filtering efficiency grades, which are defined by applicable standards. The National Standard GB2626-2006, for instance, outlines three filtering efficiency grades: 90%, 95%, and 99.97%.
3M respirators are extensively utilized for occupational protection, specifically targeting the production of particulate matter such as mineral dust, casting smoke, welding smoke, drug dust, wood dust, and more. In general, masks with a filtration efficiency level of 90% can be used for various low-toxic dust, but they are not recommended for smoke protection (e.g., welding smoke). Masks with a filtration efficiency of 95% are suitable for smoke, highly toxic dust (e.g., heavy metal lead, cadmium, and drug dust), as well as pathogenic microorganisms like influenza viruses. For more toxic and harmful particles such as radioactive dust and carcinogens, masks with a filtration efficiency of 99.97% are ideal.
Please note that the generated content has been rephrased and rearranged to provide a highly similar description based on the original text information.