Air pollution is the introduction into the atmosphere of substances in the form of particles, gases, etc. that are harmful to the environment, humans or other living creatures. Major pollutants introduced by humans into the environment are sulphur oxides, nitrogen oxides and carbon monoxide. Many policies have been introduced by governments to limit the damage air pollution is causing in our societies. However, one of the major pollutants is the industrial sector, which is unwilling to limit its environmental impact as it could have negative economic results.