Pollution can arise from the consumption or use of products (product pollution) or the production of those products (process pollution). Examples of product pollution include the consumption of foods contaminated with pesticides, the use of aerosol sprays with ozone depleting chemicals, driving vehicles, heating homes with polluting fuels, etc. Examples of process pollution include water.
Pollution control, in environmental engineering, any of a variety of means employed to limit damage done to the environment by the discharge of harmful substances and energies. Specific means of pollution control might include refuse disposal systems such as sanitary landfills, emission control.