U.S. EPA Proposes to Repeal Certain Provisions of the Mercury and Air Toxics Standards for Power Plants
Posted: June 19th, 2025
On June 11, 2025, the United States Environmental Protection Agency (U.S. EPA) proposed to repeal certain provisions of the 2024 amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Coal- and Oil-Fired Electric Utility Steam Generating Units […]
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U.S. EPA Proposes to Repeal GHG Standards for Fossil Fuel-Fired Power Plants
Posted: June 19th, 2025
On June 11, 2025, in response to President Trump’s energy-related Executive Orders, the United States Environmental Protection Agency (U.S. EPA) signed a proposal to repeal all greenhouse gas (GHG) emissions standards for fossil fuel-fired power plants. U.S. EPA also proposes […]
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So You Have To Do A Stack Test…
Posted: June 12th, 2025
This article will briefly describe some best practices to determine particulate matter (PM) emissions using United States Environmental Protection Agency (U.S. EPA) Methods 5 and 202 for filterable particulate matter (FPM) and condensable particulate matter (CPM), respectively. The best practices […]
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Carolinas Regulatory Updates
Posted: June 5th, 2025
The 2025 Spring Carolinas Air Pollution Control Association (CAPCA) technical workshop and forum, hosted in Asheville, NC, kicked off with two workshops, one focused on emissions factors and tools for calculating emissions, and the other focused on the intersection of […]
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What’s in the Proposed 2025 Ambient Air Monitoring Network Plan for Kentucky?
Posted: June 4th, 2025
Each year, the Kentucky Energy and Environment Cabinet releases its annual plan detailing how ambient air quality will be monitored across the Commonwealth. The Proposed 2025 Ambient Air Monitoring Network Plan is now available for public review and comment until […]
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SCAQMD – Nitric Acid Tanks Rule
Posted: May 15th, 2025
South Coast Air Quality Management (SCAQMD or District) Governing Board adopted Rule 1159.1 for the control of nitrogen oxides (NOX) emissions from nitric acid units. Rule 1159.1 is expected to impact over 900 nitric acid units across nearly 250 facilities. […]
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Air Toxics Regulatory Update
Posted: April 23rd, 2025
During the previous administration, we saw a flurry of revisions to air toxics regulations under 40 CFR Part 63. The United States Environmental Protection Agency (U.S. EPA) revised several National Emission Standards for Hazardous Air Pollutants (NESHAP) to include standards […]
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Gasoline Distribution Terminal Regulation Changes – Do You Need to Install a TOC CEMS or Update Your TOC Monitoring Strategy?
Posted: March 26th, 2025
As mentioned in a previous ALL4 article, the United States Environmental Protection Agency (U.S. EPA) finalized updates on May 8, 2024 to the Gasoline Distribution Terminal Regulations. The Gasoline Distribution Terminal Regulations include 40 CFR Part 63, Subpart R (National […]
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U.S. EPA Clarifies “Modification” as it Relates to NSPS Subpart XXa
Posted: March 6th, 2025
The United States Environmental Protection Agency (U.S. EPA) has clarified what constitutes a “modification” in response to questions received regarding the Standards of Performance for Bulk Gasoline Terminals that Commenced Construction, Modification, or Reconstruction After June 10, 2022 under 40 […]
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How do I Know if My Project Needs an Air Permit?
Posted: February 27th, 2025
There is not a whole lot that is black and white about air quality permitting. It can sometimes be hard to determine whether you need to submit an air permit application for a project and if so, what kind. The […]
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