PM2.5 (Particulate matter 2.5 microns). Conforms to standards GB2626-2006. Active carbon cloth filters atmospheric particulate matter. Reduces inhalation of particles such as haze, dust, pollen and motor vehicle exhaust emissions. Recommended to replace filter every 1 to 3 days, depending on use. 5 pack
For use with Protective face masks providing a filter pocket. Non-woven, active carbon cloth filter. PM2.5 reduces dust, particulates and allergens.
Non-woven cotton, 5 Layer Filter