Educational magazines
- Rivers and Harbors Appropriations Act
- Snow, John British Anesthesiologist (1813–1858)
- Soil Pollution
- Space Pollution
- Strong, Maurice Canadian Environmental Advocate; First Executive Director of the United Nations Environment Programme (1929–)
- Systems Science
- Technology, Pollution Prevention
- Times Beach, Missouri
- Tobacco Smoke
- Todd, John Innovative Ecological Designer (1939–)
- Toxic Release Inventory
- Treaties and Conferences
- U.S. Department of Agriculture
- U.S. Department of the Interior
- U.S. Environmental Protection Agency
- U.S. Food and Drug Administration (FDA)
- Underground Storage Tank
- Unintended Consequences
- Visual Pollution
- VOCs (Volatile Organic Compounds)