NA
Non-attainment Area wherein the area's ambient air does not meet the NAAQS
NAAQS
National Ambient Air Quality Standards
NAICS
North American Industrial Classification System (replaces SIC)
NAPSR
National Association of Pipeline Safety Representatives
NCP
National Contingency Plan or National Oil and Hazardous Substance Contingency Plan
NCRIC
National Chemical Response and Information Center (CMA)
NEIC
National Enforcement Investigation Center
NEPA
National Environmental Protection Act (1969)
NESHAP
National Emissions Standards for Hazardous Air Pollutants
NFPA
National Fire Protection Association
NGPSA
Natural Gas Pipeline Safety Act (1968)
NGL
Natural Gas Liquid(s)
NHTSA
National Highway Traffic Safety Administration
NIOSH
National Institute for Occupational Safety and Health, funded by OSHA to perform research on topics of safety and health.
NOAA
National Organic and Atmospheric Administration
NOD
Notice of Deficiency
NONC
Notice of non-compliance
NOPR
Notice of Proposed Rule Making
NOPV
Notice of Probable Violation
Normalize
Presentation of data based on a common measure or denominator allowing for better comparison of various operations. For example, the number of tons of waste disposed of based on the amount of throughput.
NOV
Notice of Violation
NOx
Nitrogen Oxides (nitrogen/oxygen compounds primarily released from the burning of fossil fuels)
NPDES
National Pollutant Discharge Elimination System. The primary permitting program under the Clean Water Act which regulates all discharges to surface water.
NPL
National Priorities List
NPRA
National Petrochemical and Refiners Association
NPRM
Notice of Proposed Rulemaking
NRC
National Response Center
NRDA
National Resource Damage Assessment
NRDC
National Resource Defense Council, Inc.
NSC
National Safety Council
NSPS
New Source Performance Standards for major stationary sources of air pollution (per 40 CFR 60 – a part of the EPA’s Clean Air Act)
New Source Review
Part of the Clean Air Act permitting program.
NTSB
National Transportation Safety Board