We call contamination to any physical, chemical or biological alteration of air, water or land that causes damage to living organisms.

The pollution of the atmosphere is caused by residues or gaseous secondary products, solid or liquid, that can endanger the health and well-being of plants and animals, attack different materials, reduce visibility or produce unpleasant odors.

Water pollution involves the incorporation into the water of foreign matter, such as microorganisms, chemicals, industrial and other waste, or wastewater. These materials deteriorate water quality and make it useless for the intended uses.

Soils can also be contaminated when various chemicals are dumped on them, such as acids or heavy minerals. Soil pollution, in addition to rendering it unusable for agricultural and livestock exploitation, also influences the deterioration of the quality of groundwater.

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