Glossary

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

National Ambient Air Quality Standards (NAAQS)	United States Environmental Protection Agency, Office of Compliance and Assurance
National Ambient Air Quality Standards (NAAQS)	United States Environmental Protection Agency, Terms of Environment
National Emissions Standards for Hazardous Air Pollutants (NESHAP)	United States Environmental Protection Agency, Office of Compliance and Assurance
National Emissions Standards for Hazardous Air Pollutants (NESHAPS)	United States Environmental Protection Agency, Terms of Environment
National Estuary Program	United States Environmental Protection Agency, Terms of Environment
National Pollutant Discharge Elimination System (NPDES)	United States Environmental Protection Agency, Office of Compliance and Assurance
National Pollutant Discharge Elimination System (NPDES)	United States Environmental Protection Agency, Terms of Environment
National Priorities List (NPL)	United States Environmental Protection Agency, Office of Compliance and Assurance
National Priorities List (NPL)	United States Environmental Protection Agency, Terms of Environment
Natural Assets	United Nations, Glossary of Environment Statistics
Natural Patrimony	United Nations, Glossary of Environment Statistics
Natural Pollutant	United Nations, Glossary of Environment Statistics
Natural Resource Accounting	United Nations, Glossary of Environment Statistics
Navigable Waters	United States Environmental Protection Agency, Terms of Environment
Necrosis	United States Environmental Protection Agency, Terms of Environment
Nematocide	United States Environmental Protection Agency, Terms of Environment
Neutralization	United States Environmental Protection Agency, Office of Compliance and Assurance
New and Renewable Energy Sources	United Nations, Glossary of Environment Statistics
New Source Performance Standards (NSPS)	United States Environmental Protection Agency, Terms of Environment
Nickel Carbonyl	United Nations, Glossary of Environment Statistics
Nitrate	United States Environmental Protection Agency, Terms of Environment
Nitrate	United Nations, Glossary of Environment Statistics
Nitric Oxide (NO)	United States Environmental Protection Agency, Terms of Environment
Nitric Oxide (NO)	United Nations, Glossary of Environment Statistics
Nitrification	United States Environmental Protection Agency, Terms of Environment
Nitrification	United Nations, Glossary of Environment Statistics
Nitrilotriacetic Acid (NTA)	United States Environmental Protection Agency, Terms of Environment
Nitrite	United States Environmental Protection Agency, Terms of Environment
Nitrites	United Nations, Glossary of Environment Statistics
Nitrogen Oxide (NOx)	United States Environmental Protection Agency, Terms of Environment
Nitrogen Oxide (NOx)	United Nations, Glossary of Environment Statistics
Nitrogenous Oxygen Demand (NOD)	United Nations, Glossary of Environment Statistics
Nitrophenols	United States Environmental Protection Agency, Terms of Environment
Nitrous Oxide (N2O)	United Nations, Glossary of Environment Statistics
No Observable Adverse Effect Level (NOAEL)	United States Environmental Protection Agency, Terms of Environment
No Observed Adverse Effect Level or No Observed Effect Level (NOAEL) or (NOEL)	United States Environmental Protection Agency, Office of Compliance and Assurance
No Till	United States Environmental Protection Agency, Terms of Environment
No-Observed-Effect-Level (NOEL)	United States Environmental Protection Agency, Terms of Environment
Noble Metal	United States Environmental Protection Agency, Terms of Environment
Noise Pollution	United Nations, Glossary of Environment Statistics
Non-Ferrous Metals	United States Environmental Protection Agency, Terms of Environment
Non-ionizing Electromagnetic Radiation	United States Environmental Protection Agency, Terms of Environment
Non-Methane Hydrocarbon (NMHC)	United States Environmental Protection Agency, Terms of Environment
Non-Point Source of Pollution	United Nations, Glossary of Environment Statistics
Non-Point Sources	United States Environmental Protection Agency, Terms of Environment
Non-potable	United States Environmental Protection Agency, Terms of Environment
Non-Produced natural assets	United Nations, Glossary of Environment Statistics
Non-Renewable Natural Resources	United Nations, Glossary of Environment Statistics
Nonpoint Source	United States Environmental Protection Agency, Office of Compliance and Assurance
Nuclear Waste Pollution	United Nations, Glossary of Environment Statistics
Nuclear Winter	United States Environmental Protection Agency, Terms of Environment
Nuclear Winter	United Nations, Glossary of Environment Statistics
Nutrient	United States Environmental Protection Agency, Terms of Environment
Nutrient	United Nations, Glossary of Environment Statistics
Nutrient Cycle	United Nations, Glossary of Environment Statistics