Pollution is the introduction of pollutants into the environment caused by instability and turmoil, or damage to the ecosystem of any physical systems for objects Alehihwaltlut could take the form of chemicals, or energy, such as noise, heat or light energy. May be contaminants, and the elements of pollution materials or external power sources, or may occur naturally. When a naturally occurring, are considered contaminants when Aonha exceed natural levels. Pollution is often classified into two types; point source pollution or contamination is not a point source. Blacksmith Institute issued a list of the most polluted places in the world.
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