Features include interactive map, in-depth stories, and more.Download now. »
The week's top five must-sees,
delivered to your inbox.
Pollution is the introduction of contaminants into a natural environment that causes instability, harm, or discomfort to the ecosystem i.e. physical systems or living organisms. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution. The Blacksmith Institute issues an annual list of the world's worst polluted places. In the 2007 issues the ten top nominees are located in Azerbaijan, China, India, Peru, Russia, Ukraine and Zambia. (via DBpedia)