Increasing pollution levels of the cities are making fresh air a thing of past. A number of sources are responsible for this rise in air pollution, these sources are both, by humans or nature. Big cities suffer the most because of the high emission of pollutants by industries, vehicles and other sources.
There will be an issue of inadequate protection for the workers with beards as far as the usage of tight-fitting respirators is concerned. Facial hair will compromise the security provided by the respirators and it restricts a good seal between the respirator and the face of the wearer.