General Aspects of Environmental Pollution
For more than 25 years, scientists all over the world are involved in studies on health effects of environmental pollution. These studies had become necessary by heavy air pollution in big cities and industrialized regions during the fifties. The level of an already high environmental pollution further increased during smog situations inhibiting transport and diffusion of air pollutants in the atmosphere. In those periods, concentrations of sulfur dioxide and particulates rose to values in the range of today’s maximal threshold limits for working places (5 and 6 mg/m3, respectively). During these smog episodes a dramatic increase of mortality was observed, especially in patients suffering from cardiovascular and lung diseases and in elderly people.