An area of low-lying wet land that holds water most of the year.

wetland dominated by nonwoody, soft-stemmed plants. missions - Refers to pollution being released or discharged into the air from natural or man-made sources. Pollutants may be released directly into the air from a structural device (i.e., smokestack, chimney, exhaust pipe) or indirectly via volatilization or dispersal (i.e., aerosol spraying).

wetland that is characterized by plants growing with their roots underwater and leaves extending above the water. A salt marsh is an estuarine emergent wetland.