4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.
D.C Circuit Court Restores Title V Affirmative Defense
Posted: October 9th, 2025
In a September 5, 2025 decision, the D.C. Circuit reinstated the affirmative defense provisions under Title V operating permits. The court found that the July 1, 2023 rule, which removed the affirmative defense provisions from Title V permits, was arbitrary […]
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Novel Approach Included in U.S. EPA’s Recent Secondary Lead Smelting Proposal
Posted: October 9th, 2025
On October 1, 2025, the U.S. Environmental Protection Agency (U.S. EPA) proposed amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Secondary Lead Smelting source category (40 CFR Part 63, Subpart X). The proposal addresses multiple […]
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Recent Electronic Reporting Updates
Posted: October 9th, 2025
Stay up-to-date with the latest changes to the United States Environmental Protection Agency’s (U.S. EPA) Compliance and Emissions Data Reporting Interface (CEDRI) and the Electronic Reporting Tool (ERT). The following updates are important to keep in mind as you submit […]
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ALL4 at the 2025 NCASI Annual Conference
Posted: October 2nd, 2025
Nine of us from ALL4 attended the 2025 NCASI Annual Conference this week in Atlanta, GA. NCASI is a technical association that serves the forest products industry by providing scientific research and technical information necessary to achieve the industry’s environmental […]
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Recent New Source Review Guidance Updates
Posted: October 2nd, 2025
In September 2025, the U.S. Environmental Protection Agency (U.S. EPA) issued three new guidance memoranda on New Source Review (NSR) topics: begin actual construction, projected actual emissions, and reactivation. The three memos are posted on U.S. EPA’s NSR policy and […]
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SCAQMD Rule 1157 – Particulate Standards for Aggregate and Related Operations
Posted: September 25th, 2025
South Coast Air Quality Management District (SCAQMD) of California adopted Rule 1157 in 2005 and amended it in 2008, with the purpose of reducing PM10 emissions from aggregate and related operations. The rule defines “aggregate operations” as operations that produce […]
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U.S. EPA’s Proposed Reconsideration of the GHGRP
Posted: September 25th, 2025
On September 16, 2025 the United States Environmental Protection Agency (U.S. EPA) published a proposed rule to Reconsider the Greenhouse Gas (GHG) Reporting Program (GHGRP) under Docket No. EPA-HQ-OAR-2025-0186. The proposed rule will remove most of the reporting requirements for […]
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How To Develop A Regulatory Compliant QA/QC Program For Your CMS – Part 2
Posted: September 25th, 2025
In Part 1 of this 4 The Record article series, the terminology for Quality Assurance (QA) and Quality Control (QC) was defined and discussed. QA activities, such as cylinder gas audits (CGAs) and relative accuracy test audits (RATAs), ensure quality […]
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Air Quality Permitting Data Centers in Pennsylvania
Posted: September 18th, 2025
The construction and air permitting of data centers continues to be a growing industry worldwide. Each country and state has their own set of requirements for the construction and permitting process. Currently, Pennsylvania is a hotbed for data center growth […]
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U.S. EPA Extends Compliance Deadlines for Oil and Natural Gas Sector
Posted: September 18th, 2025
On July 31, 2025, the United States Environmental Protection Agency (U.S. EPA) issued an interim final rule to extend compliance deadlines established for crude oil and natural gas facilities that are subject to the provisions of […]
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