Fellas, We need to stop polluting Our Earth. We need to take steps to stop air pollution. We still got Time The key to protection is in the mask’s filter. When you breathe with the mask on, air passes through five important layers of protection before it reaches your lungs. Each layer has a different density in order to filter particles of different sizes. The multi-layer filter technology is tested at the Camfil R&D center in Sweden, one of the world’s most advanced filter laboratories, a