Learn the Issues
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Basic Information of Air Emissions Factors and Quantification
This page includes basic information about air emissions factors and the Compilation of Air Pollutant Emission Factors, AP-42.
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Air Quality Management Plan Launch Event Agenda Template
Air Quality Management Plan Launch Event Agenda Template Subpage for Megacities
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Sun Safety
Help raise sun safety awareness for grades K-12, educators and the general public.
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How to Become a GreenChill Certified Store
GreenChill's Store Certification Program for Food Retailers recognizes individual stores for using environmentally friendlier commercial refrigeration systems.
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UV Radiation
June 2010 fact sheet explaining the types of ultraviolet radiation and the various factors that can affect the levels reaching the Earth's surface.
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About the Clean Air Technology Center
The Clean Air Technology Center provides resources for emerging and existing air pollution prevention and control technologies and provides public access to data and information on their use, effectiveness and cost.
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Exploring Estuaries: Glossary
Glossary of terms related to estuaries.
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Exploring Estuaries: What Challenges Do Our Estuaries Face?
An overview of the kinds of challenges faced by estuaries such as nutrient pollution, pathogens, toxic chemicals, habitat loss, invasive species, and water flow changes.
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Fact Sheet: Protection of Stratospheric Ozone: Determination 31 for Significant New Alternatives Policy Program
Under section 612 of the Clean Air Act, EPA reviews substitutes within a comparative risk framework.
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EnviroSafe Finding of Violation
This document outlines the U.S. Environmental Protection Agency reissuing an enclosed Finding of Violation (FOV) to Enviro-Safe Refrigerants, Inc. (you). We find that you have violated the Clean Air Act, 42 U.S.C. § 7413(a) (the CAA).
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Carbon Dioxide as a Fire Suppressant: Examining the Risks: Appendices
Appendices for the Carbon Dioxide as a Fire Suppressant: Examining the Risks comprehensive data review.
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Navajo Nation Abandoned Uranium Mines: Legal Documents and Settlements
Legal documents and settlements related to Navajo Nation Abandoned Uranium Mines.
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Metrics for Waste Reduction
When monitering and evaluating a waste reduction program, it is important to establish a consistent set of metrics and procedures for collecting data.
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Washington School Food Share Program Toolkit
This toolkit was developed to allow schools and food banks to work together to collect whole and packaged cafeteria leftovers and share them within their community.
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Power Resilience Webinar for Water Utilities
This webinar will cover how water utilities can prepare for and respond to power outages, including information on generator readiness and how to use FRWA’s Water Tracker, a tool that supports responses to power outages and other emergencies.
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Region 4 Regional Conferences
2019 Regional Conferences in region 4
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H2Otel Challenge
WaterSense developed the H20tel Challenge to provide water utilities and local governments with tools to promote water efficiency for their local hotels.
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TMDL Report and Approval Documents: Massachusetts Statewide TMDL for Pathogen-Impaired Waterbodies
View supporting documents for View supporting documents for Massachusetts Statewide TMDL for Pathogen-Impaired Waterbodies.
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MPRSA Research Permit: Carboniferous, Inc. Research Project
MPRSA Research Permit for the Carboniferous, Inc. Research Project for the transportation and disposition of material into ocean waters in the Gulf of America, Orca Basin
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MPRSA Research Permits
Research permits under the MPRSA may be issued by the EPA for the disposition of materials into the ocean as a part of a research project. Examples of activities authorized with an MPRSA research permit are provided.