N - No
N/A - Not Applicable
N/A - Not Available
NA - National Archives
NA - Not Applicable
NA - Nonattainment
NAA - Nonattainment Area(s)
NAAEC - North American Agreement on Environmental Cooperation
NAAG - National Association of Attorneys Geneneral
NAAQS - National Ambient Air Quality Standards
NAAS - National Air Audit System
NABN - National Atmospheric Background Network
NAC - National Agency Check
NAC - National Asbestos Council
NACA - National Agricultural Chemicals Association
NACD - National Association of Conservation Districts
NACE - National Association of Corrosion Engineers
NACEPT - National Advisory Committee on Environmental Policy and Technology
NACI - National Agency Check and Inquiry
NACO - National association of Counties
NACOSH - National Advisory Committee on Occupational Safety and Health
NADB - National Atmospheric Data Bank
NADP - National Atmospheric Deposition Program
NADPSC - National ADP service Center
NAE - National Academy of Engineering
NAEP - National Association of Environmental Professionals
NAF - Nonappropriated Funding
NAICS - North American Industrial Classification System
NAIS - Neutral Administrative Inspection System
NALD - Nonattainment Areas Lacking Demonstrations
NAM - National Association of Manufacturers
NAMA - National Air Monitoring Audits
NAMF - National Association of Metal Finishers
NAMS - National Air Monitoring Station
NAMS/MIS - National Air Monitoring Stations Management Information System
NANCO - National Association of Noise Control Officials
NAP - Naphthalene
NAPA - National Academy of Public Administration
NAPAP - National Acid Precipitation Advisory Panel
NAPAP - National Acid Precipitation Assessment Program
NAPAP - National Acid Precipitation Program Emission Inventories
NAPBN - National Air Pollution Background Network
NAPBTAC - National Air Pollution Control Technical Advisory Committee
NAPCTAC - National Air Pollution Control Techniques Advisory Committee
NAPL - Non-aqueous Phase Liquid
NAPS - National Air Pollution Surveillance
NAR - National Asbestos Registry
NARA - National Air Resources Act
NARA - National Archives and Records Administration
NARA - National Agrichemical Retailers Association
NARS - National Asbestos-Contractor Registry System
NARSTO - North American Research Strategy for Tropospheric Ozone
NAS - National Academy of Sciences
NAS - National Audubon Society
NASA - National Aeronautics and Space Administration
NASASTD - NASA Standards
NASDA - National Association of State Departments of Agriculture
NASLR - National Association of State Land Reclamationists
NASN - National Air Sampling Network
NASN - National Air Surveillance Network
NASR - National Association of Solvent Recyclers
NATICH - National Air Toxics Information Clearinghouse
NATO - North Atlantic Treaty Organization
NATS - National Air Toxics Strategy
NAWC - National Association of Water Companies
NAWDEX - National Water Data Exchange
NBAR - Nonbinding Preliminary Allocation of Responsibility
NBIC - National Board Inspection Code
NBS - National Bureau of Standards
NC - No Cost
NC - Noncarcinogen
NCA - National Coal Association
NCA - Noise Control Act
NCAC - National Clean Air Coalition
NCAF - National Clean Air Fund
NCAMP - National Coalition Against the Misuse of Pesticides
NCAPS - National Corrective Action Prioritization System
NCAQ - National Commission on Air Quality
NCAR - National Center for Atmospheric Research
NCASI - National Council of the Paper Industry for Air and Stream Improvements
NCBC - Naval Coalition Battalion Center
NCC - National Climatic Center
NCC - National Computer Center
NCCMAG - National Computer Center Management Advisory Group
NCDC - National Climatic Data Center
NCDEHNR - North Carolina Dept. of Environmental, Health, and Natural Resources
NCEA - National Center for Exposure Assessment
NCEA - National Center for Environmental Assessment
NCEPI - National Center for Environmental Publications and Information
NCF - Network Control Facility
NCG - Non-condensable Gas
NCHS - National Center for Health Statistics
NCI - National Cancer Institute
NCIC - National Crime Information Center
NCL - National Consumers League
NCLAN - National Crop Loan Assessment Network
NCLEHA - National Conference of Local Environmental Health Administrators
NCLP - National Contract Laboratory Program
NCLS - NEIC Library System
NCM - National Coal Model
NCM - Notice of Commencement of Manufacture (see NOC)
NCO - Negotiated Consent Order
NCP - National Oil and Hazarrdous Substances Pollution Contingency Plan
NCP - Noncompliance Penalties
NCP - Nonconformance Penalty
NCP - National Oil and Hazardous Substances Pollution Contingency Plan
NCPDI - National Coastal Pollutant Discharge Inventory
NCPIASI - National Council of the Paper Industry for Air and Stream Improvements
NCR - Noncompliance Report
NCR - Nonconformance Report
NCRIC - National Chemical Response and Information Center
NCRP - National Council on Radiation Protection and Measurements
NCS - National Compliance Strategy
NCSL - National Conference on State Legislators
NCTR - National Center for Toxicological Research
NCV - Nerve Conduction Velocity
NCVECS - National Center for Vehicle Emissions Control and Safety
NCWM - National Conference on Weights and Measures
NCWQ - National Commission on Water Quality
NCWS - Non-Community Water System
ND - Non-Detect(ed)
ND - Non-Detectable
NDA - New Drug Application
NDD - Negotiated Decision Document
NDDB - Natural Diversity Database
NDDN - National Dry Deposition Network
NDIR - Nondispersive Infrared Analysis
NDPD - National Data Processing Division
NDS - National Dioxin Study
NDS - National Disposal Site
NDWAC - National Drinking Water Advisory Council
NEA - National Energy Act
NEAC - National Environmental Justice Advisory Council
NEC - National Electronic Code
NECRMP - Northeast Corridor Regional Modeling Project
NEDA - National Environmental Development Association
NEDS - National Emissions Data System
NEEC - National Environmental Enforcement Council
NEEDS - Needs Survey
NEEJ - National Environmental Enforcement Journal
NEHA - National Environmental Health Association
NEIC - National Enforcement Investigation Center
NEJAC - National Environmental Justice Advisory Council
NELAC - National Environmental Laboratory Accreditation Conference
NEMA - National Electronic Manufacturers Association
NEMS - NASA Equipment Numbering System
NEP - National Energy Plan
NEP - National Estuary Program
NEPA - National Environmental Policy Act (1969)
NEPI - National Environmental Policy Institute
NEPPS - National Environmental Performance Partnership System
NER - National Emissions Report
NERA - National Economic Research Associates
NERO - National Energy Resources Organization
NEROS - Northeast Regional Oxidant Study
NESA - National Admissions Standards Act
NESCAUM - Northeast States for Coordinated Air Use Management
NESHAP(S) - National Emission Standards for Hazardous Air
Pollutants
NESPHYTO - National Phytoplankton Data Base
NETA - National Environmental Training Association
NETC - National Emergency Training Center
NETTING - Emission Trading Used to Avoid PSD/NSR Permit Review Requirements
NFA - National Fire Academy
NFA - No Further Action
NFAN - National Filter Analysis Network
NFFE - National Federation of Federal Employees
NFIB - National Federation of Independent Business
NFIP - National Flood Insurance Orogram
NFMA - National Forest Management Act
NFPA - National Fire Protection Association
NFPA - National Forest Products Association
NFRAP - No Further Remedial Action Planned
NFS - National Forest Service
NFWF - National Fish and Wildlife Foundation
ng - nanograms
NGA - National Governors Association
NGA - Natural Gas Association
ng/dscm - Nanograms per dry standard cubic meter
NGPA - National Gas Policy Act
NGWIC - National Groundwater Information Center
NHANES - National Health and Nutrition Examination Study
NHB - NASA Handbook
NHIS - National Health Interview Survey
NHMP - National Human Milk Monitoring Program
NHPA - National Historic Preservation Act
NHTSA - National Highway Traffic Safety Act
NHTSA - National Highway Traffic Safety Administration
NHWP - Northeast Hazardous Waste Project
NIC - Notification of Intent to Comply
NICS - National Institute for Chemical Studies
NICT - National Incident Coordination Team
NIEHS - National Institute of Environmental Health Sciences
NIEI - National Indoor Environmental Institute
NIH - National Institutes of Health
NIM - National Impact Model
NIMBY - Not in My Backyard
NIOSH - National Institute of Occupational Safety and Health
NIPDWR - National Interim Primary Drinking Water Regulations
NIRS - National Inorganics and Radionuclides Survey
NIS - Noise Information System
NISAC - National Industrial Security Advisory Committee
NIST - National Institute of Standards and Technology
NITEP - National Incinerator Testing and Evaluation Program
NIX - NASA Image eXchange
NJDEP - New Jersey Department of Environmental Protection
NLA - National Lime association
NLAP - National Laboratory Audit Program
NLC - National League of Cities
NLDBR - No Land Disposal Based on Recycling
NLETS - National Law Enforcement Teletype System
NLM - National Library of Medicine
NLT - Not Later Than
NMC - National Meteorological Center
NMFS - National Marine Fisheries Service
NMFWF - National Fish and Wildlife Foundation
NMHC - Nonmethane Hydrocarbons
NMI - Northeat Midwest Institute
NML - National Municipal League
NMOC - Nonmethane Organic Compound
NMP - N-methyl Pyrrolidone
NMP - National Municipal Policy
NMR - Nuclear Magnetic Resonance
NMVOC - Non-methane Volatile Organic Chemicals
NNC - Notice of Noncompliance
NNEMS - National Network of Environmental Management Studies
NNPSPP - National Non-Point Source Pollution Program
NO - Nitric Oxide
NO - Number
NO2 - Nitrogen Dioxide
NOA - New Obligation Authority
NOA - Notice of Arrival
NOA - Notice of Availability
NOAA - National Oceanic and Atmospheric Administration (Agency)
NOAC - Nature of Action Code
NOAEL - No Observed Adverse Effect Level
NOC - Notice of Commencement (of manufacture or import)
NOC - Notification of Compliance
NOD - Notice of Deficiency
NODA - Notice of Data Availability
NOEC - No Observable Effect Concentration
NOEL - No Observable Effect Level
NOES - National Occupational Exposure Survey
NOHSCP - National Oil and Hazardous Substances Contingency Plan
NOI - Notice of Intent
NOI - Not Otherwise Indicated
NOI - Not Otherwise Indexed
NOIBN - Not Otherwise Indexed by Name
NOIC - Notice of Intent to Cancel
NOIS - Notice of Intent to Suspend
NIJC - National Oil Jobbers Council
NOMS - National Organics Monitoring Survey
NON - Notice of Noncompliance
NOO - No Odor Observed
NOPES - Non-Occupational Pesticide Exposure Study
NORA - National Oil Recyclers Association
NORM - Naturally Occurring Radioactive Material
NOS - National Ocean Survey
NOS - Not Otherwise Specified
NOV - Notice of Violation (CAA, CWA, FIFRA)
NOV/C/D - Notice of Violation/Compliance/Demand
NOx - Nitrogen Oxides
NPAA - Noise Pollution and Abatement Act (1970)
NPCA - National Parks and Conservation Association
NPCA - National Pest Control Association
NPD - NASA Policy Directive
NPDES - National Pollutant Discharge Elimination System
NPDWR - National Primary Drinking Water Regulation
NPDWS - National Primary Drinking Water Standards
NPG - NASA Procedural Guidelines
NPHAP - National Pesticide Hazard Assessment Program
NPIRS - National Pesticide Information Retrieval System
NPL - National Priorities List
NPM - National Program Manager
NPN - National Particulate Network
NPRM - Notice of Proposed Rulemaking
NPS - National Park Service
NPS - National Permit Strategy
NPS - National Pesticide Survey
NPS - Non-Point Source
NPTN - National Pesticide Telecommunications Network
NPUG - National Prime User Group
NPV - Net Present Value
NRA - National Recreation Area
NRC - National Referral Center
NRC - National Research Council
NRC - National Response Center
NRC - Nonreusable Container
NRC - Nuclear Regulatory Commission
NRCA - National Resource Council of America
NRD - Natural Resource Damage
NRDA - Natural Resources Damage Assessment
NRDC - National Resources Defense Council, Inc.
NRT - National Response Team
NRWA - National Rural Water Association
NSA - National Security Agency
NSC - National Security Council
NSDWR - National Secondary Drinking Water Regulations
NSEC - National System for Emergency Coordination
NSEP - National System for Emergency Preparedness
NSF - National Sanitation Foundation
NSF - National Science Foundation
NSN - National Stock Number
NSF - National Strike Force
NSI - National Security Information
NSO - Nonferrous Smelter Orders
NSP - National Screening Program for Organics in Drinking Water
NSPE - National Society for Professional Engineers
NSPS - New Source Performance Standards
NSR - New Source Review
NSRL - No Significant Risk Level
NSR/PSD - New Source Review and Prevention of Significant Deterioration Permitting
NSTC - National Sciences and Technology Council
NSTL - National Space Technology Laboratory
NSWMA - National Solid Waste Management Association
NSWS - National Surface Water Survey
NTA - Negotiated Testing Agreement
NTE - Not to Exceed
NTGS - National Technical Guidance Studies
NTI - National Toxics Inventory
NTIS - National Technical Information Service
NTN - National Trends Network
NTNCWS - Non-transient Non-community Water System
NTP - National Toxicology Program
NTSB - National Transportation Safety Board
NTTAA - National Technology Transfer and Advancement Act
NTU - Nephlometric Turbidity Unit
NUCA - National Utility Contractors Association
NUREG - Criteria for Preparation and Evaluation of Radiological Regulations and Guides
NURF - NAPAP Utility Reference File
NVPP - National Vehicle Population Poll
NWA - National Water Alliance
NWF - National Wildlife Federation
NWP - Nationwide Permit program
NWPA - Nuclear Waste Policy Act (1982)
NWRC - National Weather Records Center
NWS - National Weather Service
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