Abbreviations & Acronyms beginning with N:

N02 = Nitrogen dioxide

N0X = Nitrogen oxides Continued below

NAAQS = National Ambient Air Quality Standards

NAFTA = North American Free Trade Agreement

NAVTEX = navigational and meteorological warning broadcast service 

NCOB = no cargo on board 

NDT = non-destructive testing 

NE = Northeast

NEB =National Energy Board

NFI = No Further Investment

NFTZ = non free trade zone 

NG = Natural Gas

NGL = Natural Gas Liquids

NGO = Non-Governmental organisation

NHPV = Net Hydrocarbon Pore Volume

NI = The Nautical Institute 

NIHQ = Nautical Institute Headquarters, London

NITC = Normal Incremental Transfer Capability

NK or NKK (or ClassNK) = Nippon Kaiji Kyokai (Japan's ship classification society)

NM = Nautical mile  

NMEA = National Marine Electronics Association 

NMFS = National Marine Fisheries Services (NOAA Fisheries)

NNR = national nature reserve 

NO = nitric oxide

NOAA = National Marine and Atmospheric Administration 

NOAA = National Oceanic and Atmospheric Administration

NOD = Notice of Determination

NOGEPA = Netherlands Oil and Gas Exploration and Production Association

NOI = Notice Of Inquiry

NOI = Notice Of Intent

NOP = Notice of Preparation

NOR = Notice of Readiness  

NPD = Norwegian Petroleum Directorate

NPDES = National Pollutant Discharge Elimination System

NPREP = National Preparedness for Response Exercise Program

NPV = Net Present Value

NRC = National Response Center

NRI = Net Revenue Interest

NRV = Non Return Valve

NSA = Norwegian Shipowners' Association

NSDG = North Sea Decommissioning Group

NT = net tonnage

NTO = National Training Organization

NUMAST = National Union of Marine, Aviation & Shipping Transport Officers  

NWI = Net Working Interest

NYMEX = New York Mercantile Exchange

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