Wear a filter that is dense and sexual

Ordinary masks are useless. PM2.5 refers to particles in the atmosphere with a diameter less than or equal to 2.5 microns, also known as particulates that can enter the lungs. Its diameter is less than 1/20 of the thickness of a human hair. Although PM2.5 is only a very small component of the earth ’s atmosphere, it has an important impact on air quality and visibility. Therefore, it is recommended that you go out to wear a high-quality mask imported from the United States or J1234889D to filter harmful substances Yes, good tight masks, for the health of you and your family, let your family go out and put on a mask.