Learn the Issues

This page shows all of the pages at www.epa.gov that are tagged with Learn the Issues.

  • Natural Radioactivity in Building Materials

    Some foods contain small amounts of radioactive elements. The amount of naturally-occurring radiation in these foods very small, and do not pose a radiation risk.

  • RadTown Radon Activity 3: Indoor Radon Levels

    Radon is a threat to health because it tends to collect inside homes and buildings, sometimes to high levels, and can cause lung cancer. In this activity, students will learn more about how to test their homes for radon, and will learn about radon levels.

  • RadTown Radon Activity 2: Radon Vacuum

    Homes and buildings draw radon into basements, pipes, and lower floors. Using this NGSS and CCSS aligned activity, students can learn more about radon in their homes and schools.

  • Natural Radionuclides in Private Wells

    Private wells are usually not regulated or inspected for radionuclides. Some states regulate private wells. Well owners are responsible for making sure their drinking water is safe to drink and should test their wells for radionuclides every three years.

  • City of Gunnison, Colorado

    The EPA is providing notice of a proposed Administrative Penalty Assessment in the form of an Expedited Settlement Agreement against the city of Gunnison, Colorado, for alleged violations associated with the management of sewage sludge in or around Gunniso

    • Comments Due Date:

  • City of Gunnison, Colorado - Clean Water Act Public Notice

    The EPA is providing notice of a proposed Administrative Penalty Assessment in the form of an Expedited Settlement Agreement against the city of Gunnison, Colorado, for alleged violations associated with the management of sewage sludge in or around Gunniso

  • Calculate Your Radiation Dose

    This page provides a general tool to calculate an estimate of your annual radiation dose from sources the public may encounter.

  • Frequent Questions: Radiological Events

    View frequently asked questions and answers related to radiological events by topic.

  • Frequent Questions: Radiation in Medicine

    Radiation in Medicine

  • Appendix: Federal Support to Hypoxia Task Force States on Nutrient Reduction Strategies Report

    This appendix to the federal strategy, completed in September 2012, describes in detail the types of assistance each agency can provide to HTF states for developing nutrient reduction strategies.

  • Radiological Emergency Response: Authorities

    This page describes EPA's authority to respond to radiological emergencies.

  • St. Clair, Missouri - Clean Water Act Public Notice

    The EPA is providing notice of a proposed Administrative Penalty Assessment in the form of an Expedited Settlement Agreement against the city of St. Clair, Missouri, for alleged violations associated with the management of sewage sludge in or around St. Cl

  • St. Clair, Missouri

    The EPA is providing notice of a proposed Administrative Penalty Assessment in the form of an Expedited Settlement Agreement against the city of St. Clair, Missouri, for alleged violations associated with the management of sewage sludge in or around St. Cl

    • Comments Due Date:
    • Geographic Locations: Missouri

  • Radioactive Decay

    Radioactive decay is the emission of energy in the form of ionizing radiation. Example decay chains illustrate how radioactive atoms can go through many transformations as they become stable and no longer radioactive.

  • Nutrient Pollution Outreach and Education Materials

    The goal of this site is to assist state and local agencies, watershed groups, nongovernmental organizations and others in developing effective outreach materials related to nutrient pollution.

  • Radiation Sources and Doses

    Radiation dose and source information the U.S., including doses from common radiation sources.

  • 2025 PM2.5 Exceedances

    View 2025 PM2.5 Exceedances for New England.

  • Radiation Health Effects

    View basic information about how radiation affects human health, including the concepts of acute and chronic exposure, internal and external sources of exposure and sensitive populations.

  • Protective Action Guides (PAGs)

    The Protective Action Guide (PAG) manual contains radiation dose guidelines that would trigger public safety measures. EPA developed Protective Action Guides to help responders plan for radiation emergencies.

  • Environmental Info in Texas

    Environmental information for Texas