Several human activities influence the earth unfavorably. A stone crusher includes a great deal of suspended particulate matter and clamor into the air. Vehicles radiate from their tail funnels oxides of nitrogen, carbon dioxide, sulfur dioxide, carbon monoxide and a complex combination of burnt hydrocarbons and dark residue which pollute the environment. Local sewage and run off from farming fields, weighed down with fertilizers and pesticides contaminate water bodies. Effluents from tanneries contain numerous unsafe chemicals that transmit foul smell. These are just a couple of cases which demonstrate how human activities cause environmental pollution. Pollution may be characterized as expansion of undesirable material into nature as a consequence of human activities. The factors which cause ecological contamination are called pollutants. Pollutants may be characterized as a physical, concoction or organic substance unexpectedly discharged into the earth which is specifically or by implication destructive to people and other living life forms. Pollutants can hurt the ecological system and may additionally cause harm to people’s well-being.
