The problems resulting from environmental change and its degradation, pose new challenges for traditional public health science. It is an accepted fact that, environmental degradation is contributing to human health threats worldwide.

These questions have aroused increasing interest in recent years. In the poorest regions of the world an estimated one in five children will not live to see their fifth birthday, primarily because of environment-related diseases. This tragedy translates into more than 11 million childhood deaths a year worldwide, mostly due to malaria, acute respiratory infections or diarrhea, all illnesses that are largely preventable.

* Environmental degradation is an important factor contributing to the burden of disease. 19%–25% of the burden of disease in developing world is linked to environmental factors. The annual cost of damage to health and quality of life due to environmental degradation; is estimated to be 1.8%–3.4% of gross domestic product in some countries. 43% of the children’s (0-14 years) mortality is attributable to poor environmental conditions.

* Thus, environmental degradation exerts significant pressure on human health. Exposure to air, water and soil pollution, to chemicals in the environment, or to noise, can cause cancer, respiratory, cardiovascular and communicable diseases, as well as poisoning and neuro-psychiatric disorders.

* Air pollution, in fact, is one obvious environmental health threat in many countries,