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• 11:11, 26 March 2020 ‎Applicable or Relevant and Appropriate Requirements (ARARs) (hist) ‎[282 bytes] ‎Webref (talk | contribs) (Created page with "Any state or federal statute that pertains to protection of human life and the environment in addressing specific conditions or use of a particular cleanup technology at a Sup...")
• 11:11, 26 March 2020 ‎Anti-Microbial (hist) ‎[123 bytes] ‎Webref (talk | contribs) (Created page with "An agent that kills microbes. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:11, 26 March 2020 ‎Anti-Degradation Clause (hist) ‎[229 bytes] ‎Webref (talk | contribs) (Created page with "Part of federal air quality and water quality requirements prohibiting deterioration where pollution levels are above the legal limit. Source: [http://www.epa.gov/OCEPAterms...")
• 11:10, 26 March 2020 ‎Antarctic "Ozone Hole" (hist) ‎[212 bytes] ‎Webref (talk | contribs) (Created page with "Refers to the seasonal depletion of ozone in the upper atmosphere above a large area of Antarctica. (See Ozone Hole.) Source: [http://www.epa.gov/OCEPAterms/ Terms of the En...")
• 11:10, 26 March 2020 ‎Antagonism (hist) ‎[176 bytes] ‎Webref (talk | contribs) (Created page with "Interference or inhibition of the effect of one chemical by the action of another. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:10, 26 March 2020 ‎Annular Space, Annulus (hist) ‎[189 bytes] ‎Webref (talk | contribs) (Created page with "The space between two concentric tubes or casings, or between the casing and the borehole wall. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:09, 26 March 2020 ‎Anisotropy (hist) ‎[1,210 bytes] ‎Webref (talk | contribs) (Created page with "In hydrology, the conditions under which one or more hydraulic properties of an aquifer vary from a reference point. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Envi...")
• 11:09, 26 March 2020 ‎Animal Studies (hist) ‎[211 bytes] ‎Webref (talk | contribs) (Created page with "Investigations using animals as surrogates for humans with the expectation that the results are pertinent to humans. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Env...")
• 11:09, 26 March 2020 ‎Animal Dander (hist) ‎[153 bytes] ‎Webref (talk | contribs) (Created page with "Tiny scales of animal skin, a common indoor air pollutant. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:09, 26 March 2020 ‎Anaerobic Decomposition (hist) ‎[237 bytes] ‎Webref (talk | contribs) (Created page with "Reduction of the net energy level and change in chemical composition of organic matter caused by microorganisms in an oxygen-free environment. Source: [http://www.epa.gov/OC...")
• 11:07, 26 March 2020 ‎Amprometric Titration (hist) ‎[224 bytes] ‎Webref (talk | contribs) (Created page with "A way of measuring concentrations of certain substances in water using an electric current that flows during a chemical reaction. Source: [http://www.epa.gov/OCEPAterms/ Ter...")
• 11:07, 26 March 2020 ‎Ambient Temperature (hist) ‎[146 bytes] ‎Webref (talk | contribs) (Created page with "Temperature of the surrounding air or other medium. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:07, 26 March 2020 ‎Ambient Medium (hist) ‎[298 bytes] ‎Webref (talk | contribs) (Created page with "Material surrounding or contacting an organism (e.g., outdoor air, indoor air, water, or soil, through which chemicals or pollutants can reach the organism. (See biological me...")
• 11:06, 26 March 2020 ‎Ambient Measurement (hist) ‎[258 bytes] ‎Webref (talk | contribs) (Created page with "A measurement of the concentration of a substance or pollutant within the immediate environs of an organism; taken to relate it to the amount of possible exposure. Source: [...")
• 11:06, 26 March 2020 ‎Ambient Air Quality Standards (hist) ‎[164 bytes] ‎Webref (talk | contribs) (Created page with "(See Criteria Pollutants and National Ambient Air Quality Standards.) Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:06, 26 March 2020 ‎Ambient Air (hist) ‎[163 bytes] ‎Webref (talk | contribs) (Created page with "Any unconfined portion of the atmosphere; open air, surrounding air. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:05, 26 March 2020 ‎Alternative Remedial Contract Strategy Contractors (hist) ‎[246 bytes] ‎Webref (talk | contribs) (Created page with "Government contractors who provide project management and technical services to support remedial response activities at National Priorities List sites. Source: [http://www.e...")
• 11:05, 26 March 2020 ‎Alternative Fuels (hist) ‎[299 bytes] ‎Webref (talk | contribs) (Created page with "Substitutes for traditional liquid, oil-derived motor vehicle fuels like gasoline and diesel. Includes mixtures of alcohol-based fuels with gasoline, methanol, ethanol, compre...")
• 11:05, 26 March 2020 ‎Alternative Compliance (hist) ‎[500 bytes] ‎Webref (talk | contribs) (Created page with "A policy that allows facilities to choose among methods for achieving emission-reduction or risk-reduction instead of command-and control regulations that specify standards an...")
• 11:05, 26 March 2020 ‎Alternate Method (hist) ‎[332 bytes] ‎Webref (talk | contribs) (Created page with "Any method of sampling and analyzing for an air or water pollutant that is not a reference or equivalent method but that has been demonstrated in specific cases-to EPA's satis...")
• 11:04, 26 March 2020 ‎Alluvial (hist) ‎[594 bytes] ‎Webref (talk | contribs) (Created page with "Relating to and/or sand deposited by flowing water. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:03, 26 March 2020 ‎Alkalinity (hist) ‎[422 bytes] ‎Webref (talk | contribs) (Created page with "The capacity of bases to neutralize acids. An example is lime added to lakes to decrease acidity. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:02, 26 March 2020 ‎Aliquot (hist) ‎[201 bytes] ‎Webref (talk | contribs) (Created page with "A measured portion of a sample taken for analysis. One or more aliquots make up a sample. (See duplicate.) Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:02, 26 March 2020 ‎Algicide (hist) ‎[160 bytes] ‎Webref (talk | contribs) (Created page with "Substance or chemical used specifically to kill or control algae. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 11:02, 26 March 2020 ‎Algal Blooms (hist) ‎[235 bytes] ‎Webref (talk | contribs) (Created page with "Sudden spurts of algal growth, which can affect water quality adversely and indicate potentially hazardous changes in local water chemistry. Source: [http://www.epa.gov/OCEP...")
• 11:00, 26 March 2020 ‎Aldicarb (hist) ‎[176 bytes] ‎Webref (talk | contribs) (Created page with "An insecticide sold under the trade name Temik. It is made from ethyl isocyanate. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:58, 26 March 2020 ‎Alachlor (hist) ‎[201 bytes] ‎Webref (talk | contribs) (Created page with "A herbicide, marketed under the trade name Lasso, used mainly to control weeds in corn and soybean fields. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:58, 26 March 2020 ‎Airborne Release (hist) ‎[133 bytes] ‎Webref (talk | contribs) (Created page with "Release of any pollutant into the air. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:58, 26 March 2020 ‎Airborne Particulates (hist) ‎[544 bytes] ‎Webref (talk | contribs) (Created page with "Total suspended particulate matter found in the atmosphere as solid particles or liquid droplets. Chemical composition of particulates varies widely, depending on location and...")
• 10:57, 26 March 2020 ‎Air/Oil Table (hist) ‎[222 bytes] ‎Webref (talk | contribs) (Created page with "The surface between the vadose zone and ambient oil; the pressure of oil in the porous medium is equal to atmospheric pressure. Source: [http://www.epa.gov/OCEPAterms/ Terms...")
• 10:55, 26 March 2020 ‎Air Toxics (hist) ‎[525 bytes] ‎Webref (talk | contribs) (Created page with "Any air pollutant for which a national ambient air quality standard (NAAQS) does not exist (i.e., excluding ozone, carbon monoxide, PM-10, sulfur dioxide, nitrogen oxide) that...")
• 10:55, 26 March 2020 ‎Air Stripping (hist) ‎[290 bytes] ‎Webref (talk | contribs) (Created page with "A treatment system that removes volatile organic compounds (VOCs) from contaminated ground water or surface water by forcing an airstream through the water and causing the com...")
• 10:55, 26 March 2020 ‎Air Sparging (hist) ‎[263 bytes] ‎Webref (talk | contribs) (Created page with "Injecting air or oxygen into an aquifer to strip or flush volatile contaminants as air bubbles up through The ground water and is captured by a vapor extraction system. Sour...")
• 10:54, 26 March 2020 ‎Air Quality Standards (hist) ‎[208 bytes] ‎Webref (talk | contribs) (Created page with "The level of pollutants prescribed by regulations that are not be exceeded during a given time in a defined area. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Enviro...")
• 10:53, 26 March 2020 ‎Air Quality Control Region (hist) ‎[273 bytes] ‎Webref (talk | contribs) (Created page with "An interstate or intrastate area designated by the U.S. Environmental Protection Agency (EPA) for the attainment and maintenance of National Ambient Air Quality Standards (NAA...")
• 10:52, 26 March 2020 ‎Air Quality Criteria (hist) ‎[200 bytes] ‎Webref (talk | contribs) (Created page with "The levels of pollution and lengths of exposure above which adverse health and welfare effects may occur. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:50, 26 March 2020 ‎Air Pollution Episode (hist) ‎[265 bytes] ‎Webref (talk | contribs) (Created page with "A period of abnormally high concentration of air pollutants, often due to low winds and temperature inversion, that can cause illness and death. (See episode, pollution.) So...")
• 10:50, 26 March 2020 ‎Air Pollution Control Device (hist) ‎[315 bytes] ‎Webref (talk | contribs) (Created page with "Mechanism or equipment that cleans emissions generated by a source (e.g., an incinerator, industrial smokestack, or an automobile exhaust system) by removing pollutants that w...")
• 10:50, 26 March 2020 ‎Air Pollution (hist) ‎[251 bytes] ‎Webref (talk | contribs) (Created page with "The presence of contaminants or pollutant substances in the air that interfere with human health or welfare, or produce other harmful environmental effects. Source: [http://...")
• 10:49, 26 March 2020 ‎Air Pollutant (hist) ‎[1,062 bytes] ‎Webref (talk | contribs) (Created page with "Any substance in air that could, in high enough concentration, harm man, other animals, vegetation, or material. Pollutants may include almost any natural or artificial compos...")
• 10:49, 26 March 2020 ‎Air Plenum (hist) ‎[229 bytes] ‎Webref (talk | contribs) (Created page with "Any space used to convey air in a building, furnace, or structure. The space above a suspended ceiling is often used as an air plenum. Source: [http://www.epa.gov/OCEPAterms...")
• 10:35, 26 March 2020 ‎Air Permeability (hist) ‎[227 bytes] ‎Webref (talk | contribs) (Created page with "Permeability of soil with respect to air. Important to the design of soil-gas surveys. Measured in darcys or centimeters-per-second. Source: [http://www.epa.gov/OCEPAterms/...")
• 10:34, 26 March 2020 ‎Air Padding (hist) ‎[234 bytes] ‎Webref (talk | contribs) (Created page with "Pumping dry air into a container to assist with the withdrawal of liquid or to force a liquefied gas such as chlorine out of the container. Source: [http://www.epa.gov/OCEPA...")
• 10:33, 26 March 2020 ‎Air Monitoring (hist) ‎[113 bytes] ‎Webref (talk | contribs) (Created page with "See monitoring Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:33, 26 March 2020 ‎Air Mass (hist) ‎[293 bytes] ‎Webref (talk | contribs) (Created page with "A large volume of air with certain meteorological or polluted characteristics--e.g., a heat inversion or smogginess--while in one location. The characteristics can change as t...")
• 10:32, 26 March 2020 ‎Air Handling Unit (hist) ‎[225 bytes] ‎Webref (talk | contribs) (Created page with "Equipment that includes a fan or blower, heating and/or cooling coils, regulator controls, condensate drain pans, and air filters. Source: [http://www.epa.gov/OCEPAterms/ Te...")
• 10:23, 26 March 2020 ‎Air Exchange Rate (hist) ‎[162 bytes] ‎Webref (talk | contribs) (Created page with "The rate at which outside air replaces indoor air in a given space. Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:23, 26 March 2020 ‎Air Curtain (hist) ‎[289 bytes] ‎Webref (talk | contribs) (Created page with "A method of containing oil spills. Air bubbling through a perforated pipe causes an upward water flow that slows the spread of oil. It can also be used to stop fish from enter...")
• 10:22, 26 March 2020 ‎Air Contaminant (hist) ‎[192 bytes] ‎Webref (talk | contribs) (Created page with "Any particulate matter, gas, or combination thereof, other than water vapor. (See air pollutant.) Source: [http://www.epa.gov/OCEPAterms/ Terms of the Environment]")
• 10:18, 26 March 2020 ‎Air Cleaning (hist) ‎[292 bytes] ‎Webref (talk | contribs) (Created page with "Indoor-air quality-control strategy to remove various airborne particulates and/or gases from the air. Most common methods are particulate filtration, electrostatic precipitat...")

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