pollutant

By admin_wla | Tue, 4 Feb 2014 - 12:13
Strictly, too much of any substance in the wrong place or at the wrong time is a pollutant. More specifically, atmospheric pollution may be defined as the presence of substances in the atmosphere, resulting from man-made activities or from natural processes that cause adverse effects to human health, property, and the environment. Source: NASA (http://earthobservatory.nasa.gov/Glossary)