Chemical pollution

"The presence or increase in our environment of chemical pollutants that are not naturally present there or are found in amounts higher than their natural background values. Most of the chemicals that pollute the environment are man-made, resulted from the various activities in which toxic chemicals are used for various purposes." (Environmental Pollution Centers, 2019) 

Sources

Environmental Pollution Centers. Entry: Chemical pollution. Accessed March 6, 2019. Available at: https://www.environmentalpollutioncenters.org/chemical/