Maidisen PM2.5 cabin filter adopts imported medical-grade HEPA filter paper, which can effectively intercept particles with diameter below 25 microns and filtration efficiency is above 95%, including airborne dust, pollen and other allergens.The combination of high quality coconut shell activated carbon, maximum adsorption of harmful air gases (nitrogen oxygen compounds, methane and ozone, etc.). Make sure the interior is well ventilated and the air is fresh, so that the interior air is comfortable.