Learn the Issues
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2025 Southern California Wildfires
On January 7, 2025, a series of catastrophic wildfires developed in Los Angeles County. EPA worked as part of an all-of-government response to these wildfires. We were tasked with removing hazardous materials from nearly 14,000 affected properties.
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Health and Environmental Effects of Particulate Matter (PM)
Particles less than 10 micrometers in diameter pose the greatest problems, because they can get deep into your lungs, and some may even get into your bloodstream. Fine particles (PM2.5) are the main cause of reduced visibility (haze).
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Status of EnviroAtlas
Where are we now? What updates have we made recently? What planned updates are in store?
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Pesticides' Impact on Indoor Air Quality
According to a recent survey, 75 percent of U.S. households used at least one pesticide product indoors during the past year. Products used most often are insecticides and disinfectants.
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TMDL Foundations Training
The objective of the Total Maximum Daily Load Foundations training course is to introduce basic TMDL concepts and enable participants to understand the process for developing TMDLs.
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Basic Information about Visibility
Visibility - Basic Information
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Patient Exposure and the Air Quality Index
Patient Exposure and the Air Quality Index
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Patient Exposure and High Particle Pollution Events
Patient Exposure and Extreme Pollution Events
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Listserv for the Climate Change Adaptation Resource Center
Details about the listserv for the Climate Change Adaptation Resource Center.
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Should You Have the Air Ducts in Your Home Cleaned?
Duct cleaning generally refers to the cleaning of various heating and cooling system components of forced air systems, including the supply and return air ducts and registers, grilles and diffusers, heat exchangers heating and cooling coils.
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Nitrogen Dioxide's Impact on Indoor Air Quality
The two most prevalent oxides of nitrogen are nitrogen dioxide (NO2) and nitric oxide (NO). Both are toxic gases with NO2 being a highly reactive oxidant and corrosive. The primary sources indoors are combustion processes.
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Where Combined Sewer Overflow Outfalls Are Located
Overview of combined sewer overflows (CSO), guidance, and policies.
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Combined Sewer Overflows in the Great Lakes Basin-Pennsylvania
There are 184 communities in the United States portion of the Great Lakes Basin that have combined sewer overflows (CSOs).
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Combined Sewer Overflows in the Great Lakes Basin-Wisconsin
There are 184 communities in the United States portion of the Great Lakes Basin that have combined sewer overflows (CSOs).
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Keys to Permitting Success
EPA's Smart Sectors Program is discovering strategies that result in efficient environmental permitting processes.
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Combined Sewer Overflows in the Great Lakes Basin-New York
There are 184 communities in the United States portion of the Great Lakes Basin that have combined sewer overflows (CSOs).
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Webinar Announcement - Sponsorship: A Unique Tool for Funding Land Conservation Projects with the CWSRF
This webinar, presented by EPA and the USDA, will provide specific examples from states and explain the role of sponsorship and partnerships with land trust organizations.
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Project Waiver of American Iron and Steel Requirements to Quincy, Massachusetts for 16-Inch Cast Iron Gate Valves
Approved AIS waiver request.
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Request for AIS Waiver for Emergency Loan Program Projects for the State of Oregon (DWSRF)
This waiver request has been received by EPA and are open for a 15-day public comment period. Once the public comment period has closed, the waiver will be reviewed by EPA.