Pollution is the introduction of contaminants into the natural environment that cause adverse change. 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 non point source pollution.
Forms of pollution
The Lachine Canal in MontrealCanada, is polluted.
The major forms of pollution are listed below along with the particular contaminant relevant to each of them: