Educational magazines
- Mold Pollution
- Nader, Ralph American Consumer Advocate and Environmentalist (1934–)
- National Pollutant Discharge Elimination System (NPDES)
- National Toxics Campaign
- Natural Resource Damage Assessment (NRDA)
- Nelson, Gaylord U.S. Senator (D-Wisconsin) and Founder of Earth Day (1916–)
- Noise Control Act of 1972
- Nonaqueous Phase Liquids (NAPLS)
- Nonpoint Source Pollution
- Particulates
- Persistent Bioaccumulative and Toxic (PBT) Chemicals
- Pollution Prevention
- Pollution Shifting
- Property Rights Movement
- Public Interest Research Groups (PIRGs)
- Public Policy Decision Making
- Radioactive Fallout
- Regulatory Negotiation
- Resource Conservation and Recovery Act
- Right to Know