Learn the Issues
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Particulate Matter (PM) Pollution
Particulate matter (PM) is one of the air pollutants regulated by the National Ambient Air Quality Standards (NAAQS). Reducing emissions of inhalable particles improves public health as well as visibility.
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Class V Underground Injection Control Study
The report presents the results of a comprehensive EPA study on 22 types of Class V wells.
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Lead at Superfund Sites: Related Links
View a variety of links for information related to lead and lead cleanup at Superfund sites.
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EPA Office of Inspector General identifies that EPA staff did not elevate significant issues in Benton Harbor’s water system
EPA Office of Inspector General identifies that EPA staff did not elevate significant issues in Benton Harbor’s water system
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CADDIS Volume 1: Stressor Identification
home page for volume 1:stressor identification of caddis
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CADDIS Volume 3: Examples and Applications
Landing page for CADDIS Volume 3 content
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CADDIS Volume 4: Data Analysis
CADDIS Volume 4 introduction -- Learn more about different analytical techniques that can be used to generate and evaluate evidence in causal assessments.
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The EPA OIG Identifies Multiple Factors Contributed to the Delay in Constructing CSO Tanks at the Gowanus Canal Superfund Site in NYC
The EPA OIG Identifies Multiple Factors Contributed to the Delay in Constructing CSO Tanks at the Gowanus Canal Superfund Site in NYC
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Radionuclide Basics: Technetium-99
Technetium-99 (chemical symbol Tc-99) is a silver-gray, radioactive metal. It occurs naturally in very small amounts in the earth's crust, but is primarily man-made. Technetium-99m is a short-lived form of Tc-99 that is used as a medical diagnostic tool.
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Radionuclide Basics: Thorium
Thorium is a naturally occurring radioactive metal found at trace levels in soil, rocks, plants and animals. Thorium is used very little in industry, but can be found in heat-resistant alloys and paints and optical lenses.
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Radionuclide Basics: Tritium
Tritium is a hydrogen atom that has two neutrons in the nucleus and one proton. It is radioactive and behaves like other forms of hydrogen in the environment. Tritium is produced naturally in the upper atmosphere and as a byproduct of nuclear fission.
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Radionuclide Basics: Uranium
Uranium (chemical symbol U) is a naturally occurring radioactive element. Uranium is a primordial element that is used in nuclear power generation. Uranium is no longer mined for defense purposes.
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Radionuclide Basics: Radon
Radon (chemical symbol Rn) is an odorless, colorless, radioactive gas. It is the second leading cause of lung cancer in the United States.
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Radionuclide Basics: Strontium-90
Strontium (chemical symbol Sr) is a silvery metal that rapidly turns yellowish in air. Naturally occurring strontium is not radioactive.
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Radionuclide Basics: Radium
Radium (chemical symbol Ra) is a naturally occurring radioactive element. The most common isotopes of radium are radium-226 and radium-228.
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Performance Partnership Grants for Tribes in Region 10
Performance Partnership Grants (PPGs) for tribes in EPA's Region 10 (Pacific Northwest and Alaska).
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Radionuclide Basics: Plutonium
Plutonium (chemical symbol Pu) is a radioactive metal. Plutonium is considered a man-made element. Plutonium-239 is used to make nuclear weapons. Pu-239 and Pu-240 are byproducts of nuclear reactor operations and nuclear bomb explosions.
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Radionuclide Basics: Iodine
Iodine (chemical symbol I) is produced commercially for medical and industrial uses through nuclear fission. Iodine-129 and I-131 are the radioisotopes that are commonly used and will have the greatest impact on the environment if released.
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Radionuclide Basics: Cesium-137
The most common radioactive form of cesium (chemical symbol Cs) is Cesium-137. Cesium-137 is produced by nuclear fission for use in medical devices and gauges and is one of the byproducts of nuclear fission in nuclear reactors and nuclear weapons testing.
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Data & Data Products: Substance Registry Services Widget
Information and embed code for EPA's SRS Widget