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
Not applicable, not available; not determined.
see DOT Identification Numbers.
National Ambient Air Quality Standards; standards under CAA that require states to develop SIPs and establish maximum air pollutant emissions standards.
National Air Audit System.
National Asbestos Council.
National Agricultural Chemicals Association.
National Atmospheric Data Bank.
National Atmospheric Deposition Program.
National Academy of Engineering .
National Association of Environmental Professionals.
Neutral Administrative Inspection System.
Nonattainment Areas Lacking Demonstrations.
National Association of Manufacturers.
National Air Monitoring Audits.
National Association of Metal Finishers.
National Air Monitoring System.
National Association of Noise Control Officials.
National Acid Precipitation Assessment Program.
National Air Pollution Background Network.
National Air Pollution Control Technical Advisory Committee.
National Asbestos Registry.
National Air Resources Act.
National Archives and Records Administration.
stupor or unconsciousness often produced by exposure to organic chemicals.
An material that produces stupor, insensibility and sometimes unconsciousness.
refers to an objective description of the actions observed by the evaluator during the exercise. Identifies issues raised during the course of the exercise activities and includes recommendations for improvement.
National Asbestos-Contractor Registry System.
National Academy of Sciences.
National Aeronautics and Space Administration.
National Air Toxics Information Clearinghouse.
National Ambient Air Quality Standards (NAAQS)
air quality standards established by EPA that apply to outside air.
National Emissions Standards For Hazardous Air Pollutants
also known as NESHAPS, these emissions standards set by EPA for an air pollutant not covered by NAAQS that may cause an increase in deaths or in serious, irreversible, or incapacitating illness.Primary standards are designed to protect human health, secondary standards to protect public welfare.
National Fire Protection Association
National Oil and Hazardous Substances Contingency Plan
the federal regulation that guides determination of the sites to be corrected under the Superfund program and the program to prevent or control spills into surface waters or other portions of the environment. (Also known as NOHSCP/NCP).
National Pollutant Discharge Elimination System (NPDES)
a provision of the Clean Water Act which prohibits discharge of pollutants into waters of the United States unless a special permit is issued by EPA, a state, or (where delegated) a tribal government on an Indian reservation.
National Primary Drinking Water Regulations (NPDWRs)
developed by the U.S. EPA, these regulations were designed to keep drinking water clean and to protect the public from waterborne disease. These regulations define either a Maximum Contaminant Level or a treatment technique requirement to control the presence of contaminants in drinking water.
National Priorities List (NPL)
EPA's list of the most serious uncontrolled or abandoned hazardous waste sites identified for possible long-term remedial action under Superfund. A site must be on the NPL to receive money from the Trust Fund for remedial action. The list is based primarily on the score a site receives from the Hazard Ranking System. EPA is required to update the NPL at least once a year.
National Response Center
the federal operations center that receives notification of all releases of oil and hazardous substances into the environment. The Center, open 24 hours a day, is operated by the U.S. Coast Guard, which evaluates all reports and notifies the appropriate agency.
National Response Team (NRT)
representatives of 13 federal agencies that, as a team, coordinate federal responses to nationally significant incidents of pollution and provide advice and technical assistance to the responding agency(ies) before and during a response action.
National Toxicology Program
a natural fuel containing methane and hydrocarbons that occurs in certain geologic formations.
means land, fish, wildlife, biota, air, water, ground water, drinking water supplies, and other such resources belonging to, managed by, held in trust by, appertaining to, or otherwise controlled by the United States (including the resources of the exclusive economic zone defined by the Magnuson Fishery Conservation and Management Act of 1976), any state or local government, any foreign government, any Indian tribe, or, if such resources are subject to a trust restriction on alienation, any member of an Indian tribe.
the process of survival of the fittest, by which organisms that adapt to their environment survive and those that don't disappear.
naturally occurring background levels
ambient concentrations of chemicals that are present in the environment and have not been influenced by humans (e.g., aluminum, manganese).
a tendency to vomit; a feeling of sickness in the stomach.
traditionally, waters sufficiently deep and wide for navigation by all, or specified sizes of vessels; such waters in the United States come under federal jurisdiction and are included in certain provisions of the Clean Water Act.
as defined by 40 CFR 110.1, means the waters of the United States, including the territorial seas. The term includes: (a) All waters that are currently used, were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters that are subject to the ebb and flow of the tide; (b) Interstate waters, including interstate wetlands; (c) All other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, and wetlands, the use, degradation, or destruction of which would affect or could affect interstate or foreign commerce including any such waters:(1) That are or could be used by interstate or foreign travelers for recreational or other purposes;(2) From which fish or shellfish are or could be taken and sold in interstate or foreign commerce;(3) That are used or could be used for industrial purposes by industries in interstate commerce; (d) All impoundments of waters otherwise defined as navigable waters under this section; (e) Tributaries of waters identified in paragraphs (a) through (d) of this definition, including adjacent wetlands; and (f) Wetlands adjacent to waters identified in paragraphs (a) through (e) of this definition: Provided, that waste treatment systems (other than cooling ponds meeting the criteria of this paragraph) are not waters of the United States.
National Association of Water Companies.
National Water Data Exchange.
Nonbinding Preliminary Allocation of Responsibility.
National Bureau of Standards.
National Coal Association.
Noise Control Act.
National Clean Air Coalition.
National Clean Air Fund.
National Coalition Against the Misuse of Pesticides.
National Commission on Air Quality.
National Center for Atmospheric Research.
Naval Coalition Battalion Center.
National Center for Health Statistics.
National Cancer Institute. A part of the National Institutes of Health that studies cancer.
National Coal Model.
Notice of Commencement of Manufacture.
Negotiated Consent Order.
National Contingency Plan (1990); federal regulation promulgated to implement CERCLA and CWA sec. 311.
National Chemical Response and Information Center.
National Compliance Strategy.
National Commission On Water Quality.
Negotiation Decision Document.
Natural Diversity Database.
Nondispersive Infrared Analysis.
National Dioxin Study.
National Disposal Site.
Non-Domestic Substances List (Environment Canada).
National Drinking Water Advisory Council.
National Energy Act.
National Electric Code.
death of cells that can discolor areas on a plant or kill the entire plant.
National Environmental Development Association.
National Emissions Data Systems.
National Electrical Manufacturers Association.
Neoplastic effects; production of tumors.
A condition characterized by the presence of now growths (tumors). EXAMPLE LAY LANGUAGE: (benign or malignant) tumor.
a new or abnormal tissue growth that is uncontrollable and progressive.
A material that may cause effects and potential injury to the kidneys. EXAMPLE LAY LANGUAGE: material that may cause kidney damage, kidney toxin, causes kidney damage.
a chemical agent which is destructive to nematodes (round worms or threadworms).
National Estuary Program.
National Environmental Policy Act.
National Emissions Report.
Northeast Regional Oxidant Study.
Northeast States for Coordinated Air Use Management.
National Emission Standards for Hazardous Air Pollutants; federal emissions standards for HAPs regulated under CAA.
National Emergency Training Center.
Emission Trading Used to Avoid PSD/NSR Permit Review Requirements.
Describing a nerve or the nervous system.
inflammation of the nerves.
A material that affects the nerve cells and may produce emotional or behavioral abnormalities. EXAMPLE LAY LANGUAGE: cause effects on nervous system.
in pH terms, 7; neither acid nor basic.
to render chemically harmless; to return the pH to the neutral level of 7 by adding acid (base) to a basic (acidic) compound.
most commonly, a chemical reaction that produces a resulting environment that is neither acidic nor alkaline.Also, the addition of a scavenger chemical to an aqueous system in excess concentration to eliminate a corrosive factor, such as dissolved oxygen.
any stationary source which is built or modified after publication of final or proposed regulations that prescribe a standard of performance which is intended to apply to that type of emission source.
new source performance standards (NSPS)
uniform national EPA air emission and water effluent standards which limit the amount of pollution allowed from new sources or from existing sources that have been modified.
new tank system
means a tank system that will be used to contain an accumulation of regulated substances and for which installation has commenced after December 22, 1988 (See also "Existing Tank System.")
No Further Action.
National Filter Analysis Network.
National Forest Management Act.
National Fire Protection Association. An international voluntary membership organization to promote/improve fire protection and prevention and establish safeguards against loss of life and property by fire. Best known for the National Fire Codes, 16 volumes of standards, recommended practices, and manuals developed (and periodically updated) by NFPA communities. NFPA 704M publication is the code for showing hazards of materials using the familiar diamond-shaped label with appropriate numbers or symbols (NFPA hazard rating).
National Forest Service.
Nanogram. One billionth, 10^^-9, of a gram.
National Governors Association.
Natural Gas Policy Act.
National Ground Water Information Center.
National Health and Nutrition Examination Study.
Northeast Hazardous Waste Project.
National Institute for Chemical Studies.
National Institute of Environmental Health Sciences.
National Indoor Environmental Institute.
National Institutes of Health.
National Impact Model.
Not In My Back Yard.
National Institute of Occupational Safety and Health. The agency of the Public Health Service that tests and certifies respiratory and air sampling devices. It recommends exposure limits to OSHA for substances, investigates incidents, and researches occupational safety.
National Interim Primary Drinking Water Regulations.
Noise Information System.
National Incinerator Testing and Evaluation Program.
a compound containing nitrogen which can exist in the atmosphere or as a dissolved gas in water and which can have harmful effects on humans and animals. Nitrates in water can cause severe illness in infants and cows.
nitric oxide (NO)
a gas formed by combustion under high temperature and high pressure in an internal combustion engine. It changes into nitrogen dioxide in the ambient air and contributes to photochemical smog.
the process whereby ammonia in wastewater is oxidized to nitrite and then to nitrate by bacterial or chemical reactions.
Nitrilotriacetic Acid (NTA)
a compound being used to replace phosphates in detergents.
(1) an intermediate in the process of nitrification.(2) Nitrous oxide salts used in food preservation.
nitrogen dioxide (NOà)
the result of nitric oxide combining with oxygen in the atmosphere; a major component of photochemical smog.
nitrogen oxide (NOx)
product of combustion from transportation and stationary sources and a major contributor to the formation of ozone in the troposphere and acid deposition.
animal or plant residues that contain large amounts of nitrogen.
New Jersey Department of Environmental Protection.
National Laboratory Audit Program.
National Library of Medicine.
National Marine Fisheries Service.
Nonmethane Organic Compound.
National Municipal Policy.
Nuclear Magnetic Resonance.
Notice of Noncompliance.
National Non-Point Source Pollution Program.
a notation meaning oxides of nitrogen. See nitric oxide.
National Oceanic and Atmospheric Administration.
No Observed Adverse Effect Level.
Not otherwise classified.
Non Ozone Depleting Chlorinated Cleaners.
Octal Alcohol No Foam (ETUS).
National Oil and Hazardous Substances Contingency Plan.
Notice of Noncompliance.
geographic area which does not meet one or more of the National Ambient Air Quality Standards for the criteria pollutants designated in the Clean Air Act.
hardness in water caused by chlorides, sulfates, and nitrates of calcium and magnesium.
with respect to motor fuel means not for resale.
non-community water system
a public water system that is not a community water system, e.g., the water supply at a camp site or national park.
gaseous material not liquefied when associated water vapor is condensed in the same environment.
any pollutant which is not a statutorily listed or which is poorly understood by the scientific community.
chemicals that are not detected in a particular sample above a certain limit. This limit usually will be the quantitation limit for the chemical in that sample. (Note, however, that it is possible to detect and estimate concentrations of chemicals below the quantitation limit but above the detection limit.
incapable of being easily ignited or burning with extreme rapidity when lighted. Also, a DOT hazard class for any compressed gas other than a flammable one.
non-ionizing electromagnetic radiation
(1) radiation that does not change the structure of atoms but does heat tissue and may cause harmful biological effects. (2) Microwaves, radio waves, and low frequency electromagnetic fields from high voltage transmission lines.
non-liquefied compressed gas
DOT describes as a gas, other than gas in solution, which under the charged pressure is entirely gaseous at a temperature of 70¿F.
in dose-response experiments, the experimental exposure level representing the highest level tested at which no adverse effects were demonstrated.
pollution sources which are diffuse and do not have a single point of origin or are not introduced into a receiving stream from a specific outlet. The pollutants are generally carried off the land by stormwater runoff. The commonly used categories for non-point sources are: agriculture, forestry, urban, mining, construction, dams and channels, land disposal, and saltwater intrusion.
polymerized or colloidal silica.
nontransient noncommunity system
in contrast to the transient noncommunity systems described above, nontransient noncommunity water systems serve the same 25 people for at least six months a year.Examples include schools, factories, and other workplaces that have their own drinking water supply.
any undesired sound.
in dose-response experiments, the experimental exposure level representing the highest level tested at which no effects at all were demonstrated.
Non-Occupational Pesticide Exposure Study.
National Oil Recyclers Association.
National Ocean Survey.
refers to a process involving the dissemination of the emergency and informational messages provided to the public regarding a hazardous materials incident/accident. This notification process should follow the alert.
Notice of Violation.
nitrogen oxide; gases released primarily from the burning of fossil fuels; associated with breakdown of Earth's protective ozone layer.
Notice of Violation/Compliance/Demand.
Noise Pollution and Abatement Act.
National Paint and Coatings Association. The trade association of manufacturers that developed the HMIS labeling system. (1500 Rhode Island Avenue, NW., Washington, DC 20005; (202) 462-6272). See HMIS.
National Pollutant Discharge Elimination System; federal permitting system required for hazardous effluents.
National Primary Drinking Water Standards.
National Pesticide Information Retrieval System.
National Priorities List; official list of hazardous waste sites to be addressed by CERCLA.
National Program Manager.
National Particulate Network.
Notice of Proposed Rulemaking.
National Park Service.
National Permit Strategy.
National Pesticide Survey.
Nuclear Regulatory Commission; National Response Center.
National Research Council.
National Response Center.
National Resource Council of America.
Natural Resources Defense Council.
National Response Team - 1 "Hazardous Materials Emergency Planning Guide"
National Response Team - 2 "Developing a Hazardous Materials Exercise Program"
National Rural Water Association.
National Secondary Drinking Water Regulations.
National Strike Force (SARA); National Sanitation Foundation.
National Sanitation Foundation.
National Science Foundation.
National Society for Professional Engineers.
New Source Performance Standards; air emissions standards under CAA for new air pollutions sources.
the neutral sulfite, semichemical pulping process.
National Solid Waste Management Association.
National Surface Water Survey.
nitrilotriacetic acid, a chelant with the sodium salt being the usual form.
Negotiated Testing Agreement.
National Technical Guidance Studies.
National Technical Information Service.
National Toxicology Program. Federal activity overseen by the Department of Health and Human Services with resources from National Institutes of Health, the Food and Drug Administration, and the Center for Disease Control. Its goals are to develop tests useful for public health regulations of toxic chemicals, to develop toxicological profiles of materials, to foster testing of materials, and to communicate the results for use by others.(NTP Information Office, MD B2-04, Box 12233 , Research Triangle Park , NC 27709 ).
National Transportation Safety Board.
dusts that do not produce significant organic disease or toxic effects from "reasonable" concentrations and exposures. TLV of 10 mg/m3 or 30 mppcf.
nuclear power plant
a device that converts atomic energy into usable power; heat produced by a reactor makes steam to drive electricity-generated turbines.
prediction by some scientists that smoke and debris rising from massive fires resulting from a nuclear war could enter the atmosphere and block out sunlight for weeks or months. The scientists making this prediction project a cooling of the earth's surface, and changes in climate which could, for example, negatively effect world agricultural and weather patterns.
elements or compounds essential to growth and development of living things; carbon, oxygen, nitrogen, potassium and phosphorus.
National Water Alliance .
National Wildlife Federation.
Nuclear Waste Policy Act.
National Weather Service.
spastic, involuntary motion of the eyeballs.