Learn the Issues
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Maui Wildfires
Information about EPA’s response, cleanup and recovery efforts on Maui after the August 8, 2023 wildfires in Lāhainā, Upper Kula, Upper Makawao, and Olinda on the island of Maui.
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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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Buffalo River AOC
Describes history of the AOC, beneficial use impairments and sources of pollution.
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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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Federal Draft Permit for Envirite of Ohio, Inc.
This permit allows Envirite of Ohio to continue operation as a commercial hazardous waste storage and treatment facility that engages in treatment and recovery of industrial wastes.
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Tejon Gas Station, Bakersfield, CA; Approval of Request for Coverage under General Air Quality Permit
Public notice of approval of Request for Coverage under the General Air Quality Permit for New or Modified Minor Source Dispensing Facilities in Indian Country within California in Indian Country issued to Tejon Gas Station, Bakersfield, CA.
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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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EPA in Maine
Portal for news and information about EPA's efforts in Maine.
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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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WIFIA Federal Requirements
Projects receiving WIFIA credit assistance must comply with all federal laws and regulations, including environmental compliance requirements and other compliance requirements.
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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).