Pollution of the air or atmospheric.

The pollution of the air is one of the problems you set that this worrying to the world nowadays. Let's see some basic concepts.
 What does understand himself for pollution of the air or atmospheric? There is understood by air pollution any alteration of the terrestrial atmosphere capable of causing environmental impact for the gas addition or solid or liquid particles in suspension in different proportions from natives, that it could put in risk to persons, animals and plants, as well as attack to different materials, reduce the visibility or produce disagreeable smells.