Laboratory Terms N

A glossary of science, chemistry, environmental and laboratory terms.

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65 results match your search term:  N


National Ambient Air Quality Standards NAAQS
Standards established by EPA that apply for outdoor air throughout the country.

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National Emissions Standards for Hazardous Air Pollutants NESHAPS
Emissions standards set by EPA for an air pollutant not covered by NAAQS that...

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National Environmental Performance Partnership Agreements
System that allows states to assume greater responsibility for environmental ...

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National Estuary Program
A program established under the Clean Water Act Amendments of 1987 to develop...

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National Municipal Plan
A policy created in 1984 by EPA and the states in 1984 to bring all publicly ...

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National Oil and Hazardous Substances Contingency Plan NOHSCP
The federal regulation that guides determination of the sites to be corrected...

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National Pollutant Discharge Elimination System NPDES
A provision of the Clean Water Act which prohibits discharge of pollutants in...

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National Priorities List NPL
EPA's list of the most serious uncontrolled or abandoned hazardous waste site...

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National Response Center
The federal operations center that receives notifications of all releases of ...

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National Response Team NRT
Representatives of 13 federal agencies that, as a team, coordinate federal re...

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National Secondary Drinking Water Regulations
Commonly referred to as NSDWRs.

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Navigable Waters
Traditionally, waters sufficiently deep and wide for navigation by all, or sp...

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NDMA
NDMA stands for N-Nitrosodimethylamine (C2H6N2O) and is a semi-volatile organ...

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Necrosis
Death of plant or animal cells or tissues. In plants, necrosis can discolor s...

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Negotiations
After potentially responsible parties are identified for a site, EPA coordina...

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Nematocide
A chemical agent which is destructive to nematodes.

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Nephelometric
Method of of measuring turbidity in a water sample by passing light through t...

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Netting
A concept in which all emissions sources in the same area that owned or contr...

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Neutralization
Decreasing the acidity or alkalinity of a substance by adding alkaline or aci...

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New Source
Any stationary source built or modified after publication of final or propose...

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New Source Performance Standards NSPS
Uniform national EPA air emission and water effluent standards which limit th...

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New Source Review NSR
A Clean Air Act requirement that State Implementation Plans must include a pe...

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Nitrate
A compound containing nitrogen that can exist in the atmosphere or as a disso...

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Nitric Oxide NO
A gas formed by combustion under high temperature and high pressure in an int...

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Nitrification
The process whereby ammonia in wastewater is oxidized to nitrite and then to ...

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Nitrilotriacetic Acid NTA
A compound now replacing phosphates in detergents.

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Nitrite
1. An intermediate in the process of nitrification. 2. Nitrous oxide salts us...

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Nitrogen Dioxide NO2
The result of nitric oxide combining with oxygen in the atmosphere; major com...

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Nitrogen Oxide NOx
The result of photochemical reactions of nitric oxide in ambient air; major c...

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Nitrogenous Wastes
Animal or vegetable residues that contain significant amounts of nitrogen.

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Nitrophenols
Synthetic organopesticides containing carbon, hydrogen, nitrogen, and oxygen.

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No Further Remedial Action Planned
Determination made by EPA following a preliminary assessment that a site does...

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No Observable Adverse Effect Level NOAEL
An exposure level at which there are no statistically or biologically signifi...

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No Till
Planting crops without prior seedbed preparation, into an existing cover crop...

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No-Observed-Effect-Level NOEL
Exposure level at which there are no statistically or biological significant ...

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Noble Metal
Chemically inactive metal such as gold; does not corrode easily.

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Noise
Product-level or product-volume changes occurring during a test that are not ...

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Non-Aqueous Phase Liquid NAPL
Contaminants that remain undiluted as the original bulk liquid in the subsurf...

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Non-Attainment Area
Area that does not meet one or more of the National Ambient Air Quality Stand...

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Non-Binding Allocations of Responsibility NBAR
A process for EPA to propose a way for potentially responsible parties to all...

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Non-Community Water System
A public water system that is not a community water system; e.g. the water su...

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Non-Compliance Coal
Any coal that emits greater than 3.0 pounds of sulfur dioxide per million BTU...

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Non-Contact Cooling Water
Water used for cooling which does not come into direct contact with any raw m...

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Non-Conventional Pollutant
Any pollutant not statutorily listed or which is poorly understood by the sci...

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Non-Degradation
An environmental policy which disallows any lowering of naturally occurring q...

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Non-Ferrous Metals
Nonmagnetic metals such as aluminum, lead, and copper. Products made all or i...

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Non-ionizing Electromagnetic Radiation
1. Radiation that does not change the structure of atoms but does heat tissue...

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Non-Methane Hydrocarbon NMHC
The sum of all hydrocarbon air pollutants except methane; significant precurs...

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Non-Methane Organic Gases NMOG
The sum of all organic air pollutants. Excluding methane; they account for al...

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Non-Point Sources
Diffuse pollution sources (i.e. without a single point of origin or not intro...

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Non-potable
Water that is unsafe or unpalatable to drink because it contains pollutants, ...

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Non-Road Emissions
Pollutants emitted by combustion engines on farm and construction equipment, ...

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Non-Transient Non-Community Water System
A public water system that regularly serves at least 25 of the same non-resid...

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Nondischarging Treatment Plant
A treatment plant that does not discharge treated wastewater into any stream ...

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Nonfriable Asbestos-Containing Materials
Any material containing more than one percent asbestos (as determined by Pola...

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Nonhazardous Industrial Waste
Industrial process waste in wastewater not considered municipal solid waste o...

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Notice of Deficiency
An EPA request to a facility owner or operator requesting additional informat...

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Notice of Intent to Cancel
Notification sent to registrants when EPA decides to cancel registration of a...

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Notice of Intent to Deny
Notification by EPA of its preliminary intent to deny a permit application.

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Notice of Intent to Suspend
Notification sent to a pesticide registrant when EPA decides to suspend produ...

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Nuclear Reactors and Support Facilities
Uranium mills, commercial power reactors, fuel reprocessing plants, and urani...

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Nuclear Winter
Prediction by some scientists that smoke and debris rising from massive fires...

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Nuclide
An atom characterized by the number of protons, neturons, and energy in the n...

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Nutrient
Any substance assimilated by living things that promotes growth. The term is ...

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Nutrient Pollution
Contamination of water resources by excessive inputs of nutrients. In surface...

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