Letter N

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NAA Non-Attainment Areas (CAA and California CAA)
NAA North Atlantic Area (used within USDA, ARS -United States Department of Agriculture, Agricultural Research Service)
NAAQS National Ambient Air Quality Standards (CAA)
NACHO National Association of Chemical Hygiene Officers
NAICS North American Industry Classification System
NAS National Academy of Sciences
NBAR Nonbinding Allocation of Responsibility
NBC
Nuclear, biological and/or chemical hazard. Also sometimes referred to as CBR (Chemical, biological or radiological hazard)
NCIC National Crime Information Center
NCP National Contingency Plan (CERCLA)
NCRIC National Chemical Response and Information Center
NDPES National Pollutant Discharge Elimination System
NEBOSH National Examining Board of the Institution of Occupational Safety and Health. In the UK, NEBOSH run a certificate and a diploma course. Anyone that attains the diploma can join the Institution as a full member
NEIC National Enforcement Investigations Center (US EPA)
NEMA National Electrical Manufacturer's Association
NEPA National Environmental Policy Act, 42 USC Section 4321
NESHAPs National Emission Standards for Hazardous Air Pollutants (EPA, CAA)
NETA National Environmental Training Association, a US based organization which issues the CET credential.
NFC National Fire Code
NFPA National Fire Protection Association publishes useful hazard ratings on many chemicals. Not a regulatory
NFR National Fire Rating
NH3 Ammonia
NHTSA National Highway Traffic Safety Administration
NiCad Nickel Cadmium (battery)
NIEHS National Institute of Environmental Health Sciences, a component of the NIH
NIH National Institutes of Health - the primary health research umbrella organization of the US government, consisting of a number of specialized institutes, the CDC, and the National Library of Medicine
NIHL Noise Induced Hearing Loss
NIMBY Not In My Backyard Syndrome
NIOSH National Institute for Occupational Safety & Health An arm of the US Centers for Disease Control, it does research and suggests guidelines for exposure control, but is not a regulatory agency.
NIST National Institute of Standards and Technology, a US federal agency in the Department of Commerce. NIST is the successor to the US National Bureau of Standards.
NMFC National Motor Freight Class
NMR Nuclear Magnetic Resonance Spectroscopy used to identify structures of organic compounds by seeing how they react to magnetic fields of various frequencies
NO2 Nitrogen Dioxide
NOAA National Oceanic and Atmospheric Administration
NOAEL no-observed-adverse-effect level
NOC Notice of Commencement
NOS Not Otherwise Specified, DOT terminology used in shipping names
NOV Notice and Violation
NOX Oxides of nitrogen. Also NOx. Term is used where the particular oxide is unimportant or where a mixture is being discussed.
NPA North Plains Area (used within USDA, ARS -United States Department of Agriculture, Agricultural Research Service)
NPDES National Pollutant Discharge Elimination System (CWA)
NPL National Priority List (CERCLA)
NPR Notice of Proposed Rulemaking, one step in the formal process of issuing regulations by US Agencies.
NPT National Pipe Thread
NPTF National Pipe Thread Fine
NRC National Response Center (Federal)
NRC Nuclear Regulatory Commission, the US Federal Regulatory Agency which deals with radiation and radioactive materials.
NRCC National Registry of Clinical Chemists, administer CHO testing and certification
NREP National Registry of Environmental Professionals, Glenview, IL, (708) 724-6631
NRR Noise Reduction Rating, used as a laboratory based indicator of the relative effectiveness of hearing protectors.
NRTL Nationally Recognized Testing Laboratory
NSC National Safety Council, a US (Chicago) based safety organization dealing with industrial safety, school and college safety, transportation safety. The NSC has both organizational and individual membership and publishes a number of safety oriented pamphlets, journals, books, and data sheets. The image of a green cross on a shield together with the words "Green Cross for Safety" are trademarks controlled by NSC. Mailing address is: 1121 Spring Lake Dr.,Itasca, Illinois 60143, USA
NSF National Science Foundation
NSF National Sanitation Foundation
NSN New Substances Notification - required for new substances under CEPA, the Canadian equivalent of the US's PMN
NSPS New Source Performance Standards (CWA and CAA)
NSR New Source Review (California CAA)
NTIS National Technical Information Service
NTP Normal temperature and pressure
NTP National Toxicology Program, a program of the US government under NIEHS for the testing of chemical agents for long term toxic effects
NWPA Nuclear Waste Policy Act, 42 USC Section 10101 et seq

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