Contamination is the presence or addition to the environment of toxic substances or elements that are harmful to humans or ecosystems (living). There are differenttypes of pollution, contamination rates are the most important affecting the basic natural resources: air, soil and water. Some of the most serious environmental changes related tothe phenomena of radioactive pollution are exhaust, smog, the greenhouse effect, acid rain, destruction of the ozone layer, eutrophication of water or oil spills. There aredifferent types of pollution that depend on certain factors which affect differently to each environment
A contaminant is any substance or form of energy that can cause harm orimbalance (irreversible or not) in an ecosystem, in the physical environment or in a living being. It is always a negative alteration of the natural state of the environment, andgenerally, is generated as a result of human activity.
Air pollution means the presence in the air of substances or energy forms which involve risk, harm or serious inconvenience to peopleand property of any kind,  and that they can attack other materials, reduce visibility or produce unpleasant odors.
The name of the air pollution is usually applied
tochanges which have devastating effects on living beings and the material elements, and no other alterations harmless. The main mechanisms of air pollution are industrial processesthat involve combustion, in industries such as automobiles and Heating | Residential heaters, which generate carbon dioxide | carbon dioxide and carbon monoxide, nitrogen oxides andsulfur, among other pollutants. Also, some industries emit harmful gases in its production processes, such as chlorine and hydrocarbons that have not mad0e complete combustion