SMOG MASKS RELIEVE THE LUNGS
In Beijing, a smog mask is part of everyday life, and for a good reason. Even an ordinary scarf placed in front of the mouth reduces the number of particles inhaled by 28 %. Masks designed for cyclists remove 55-85 % of all particles larger than 0.3 micrometers, but they do not keep gases out. Masks designed for working in badly polluted environments block out more than 95% of particle pollution.