However, it may be that medical interest in the field of air pollution and its consequences for human health may
have developed only recently. Despite the fact that polluted air has always been a major threat on human health, there has not been any major supra-regional effort to change the polluting behaviour in the past 20 years. Although people have been suffering from polluted air for a along time, beginning several centuries ago, there has been no substantiated evidence for the connection between polluted air and deaths due to pulmonary diseases.