What Is A PM 2.5 Filter Mask?
PM 2.5 stands for the term ‘fine particulate matter’ and represents air pollutant particles that are up to 2.5 µm in size and composition (Aerosol Aerodynamic Diameter is less than 2.5 µm). These can be liquid or solid particles that can be fine and ultrafine. PM 2.5 particles occur
