Disposable dust masks are available in a variety of ways and must be selected for different job requirements and working conditions. The first should be based on the concentration and toxicity of the dust selection.

According to gb/t18664, "selection, use and maintenance of respiratory protective equipment", as a half mask, all dust masks are suitable for environments where hazardous concentrations do not exceed 10 times times the occupational exposure limit, otherwise a full-scale hood or a higher-protection respirator should be used.

If particulate matter is highly toxic, carcinogenic and radioactive, filter materials with the highest filtration efficiency should be selected.

If the particulate matter is oily, be sure to select the appropriate filter material.

If the particulate matter is needle-like fiber, such as slag cotton, asbestos, glass fiber, etc., because dust masks can not be washed, sticky micro-fiber masks in the face of the sealing site prone to facial stimulation, nor suitable for use. For high-temperature, high-humidity environment, choose a mask with an exhalation valve will be more comfortable, the choice of ozone-resistant masks for welding can provide additional protection, but if the ozone concentration of more than 10 times times occupational health standards can be replaced mask, dust, poison combination filter elements.

For the absence of particulate matter, and only some peculiar odor of the environment, the choice of a dust mask with activated carbon layer is much more portable than wearing a gas mask, such as some laboratory environment, but because the national standards do not have technical specifications for such masks.