Pollution refers to a situation in which there is an excess amount of something in a given setting, to the point that the setting or something in it is being impacted in an undesirable way.
One of the most common kinds of pollution is water pollution. Water may become polluted if chemicals or other liquids are mixed into it, such as when oil spills occur near offshore drilling rigs or as a result of boat motors. Water may also be polluted when objects are thrown into the water, such as old tires dumped into rivers.
Air pollution may result from human activities, such as exhaust from automobiles, trucks, factories, and fires. Air pollution also occurs naturally when volcanic dust fills the atmosphere.
Noise pollution is another example of pollution. When too many noises are present in one area or when one sound is dangerously loud, that is considered pollution.
Pollution is the contamination of the different Earth systems - land, water, and air. These contaminants or impurities are called pollutants and may come in the form of pesticides, oil spills, and exhaust gases. Ultimately, these contaminants adversely affect plant, animal, and human life. These can cause defoliation (the falling off of leaves in plants), fish kill, as well as various kinds of diseases including cancer and birth defects.
Several environmental concerns are associated with pollution. These include greenhouse gases, global warming, climate change, deforestation, urbanization, industrialization, and the gradual loss of viable ecosystems.