U.S. EPA Finalizes Combustion Turbine NSPS Revisions
Posted: January 27th, 2026
Less than one week after being signed by U.S. Environmental Protection Agency (U.S. EPA) Administrator Lee Zeldin, the Combustion Turbine New Source Performance Standards (NSPS) revisions were published in the Federal Register on January 15, 2026 and thus, are now […]
Read article
2026 Look Ahead
Posted: January 14th, 2026
2026 Look Ahead Intro // Colin McCall Happy New Year to all of our readers. We are looking forward to another year of work and camaraderie with our colleagues, clients, and partners. In keeping with tradition, we use our January […]
Read article
2026 Air Quality Look Ahead
Posted: January 14th, 2026
While 2025 brought a new administration and changes to how the United States Environmental Protection Agency (U.S. EPA) approaches air quality regulation and policy, we expect to see even more air quality regulatory activity in 2026. The Spring 2025 regulatory […]
Read articleSCAQMD Permitting 101: What Industrial Facilities Need to Know (and Do) Before They Apply
Posted: January 8th, 2026
In our previous 4 The Record article on the South Coast Air Quality Management District (SCAQMD), we introduced who they are and what they do. This article expands on the process of obtaining an air quality permit from SCAQMD. Do […]
Read articleU.S. EPA Finalizes Oil and Gas Compliance Deadline Extension
Posted: January 8th, 2026
Revisiting Our Previous Update In our earlier blog post, U.S. EPA Extends Compliance Deadlines for Oil and Natural Gas Sector, we discussed the interim final rule (IFR) issued in July 2025 that provided temporary compliance relief under the 2024 Clean […]
Read article
U.S. EPA Seeks Public Comment on Updated Draft Formaldehyde Risk Calculation Memorandum to Inform Risk Evaluation under the Toxic Substance Control Act
Posted: January 8th, 2026
On December 3, 2025, the United States Environmental Protection Agency (U.S. EPA or Agency) announced availability of and solicitation for public comment on an Updated Draft Risk Calculation Memorandum (Risk Calculation Memo) for formaldehyde (HCHO) under the Toxic Substances Control […]
Read article
A Presidential Exemption for the Coke Ovens Rules
Posted: December 4th, 2025
ALL4 has covered the amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Coke Ovens: Pushing, Quenching, and Battery Stacks (PQBS) and Coke Oven Batteries (COB) at 40 CFR Part 63, Subparts CCCCC and L in previous […]
Read article
Recap of the CAPCA 2025 Fall Technical Workshop and Forum
Posted: November 13th, 2025
This year’s fall Carolinas Air Pollution Control Association (CAPCA) technical workshop and forum included a wide range of technical topics of interest to those located in the Carolinas and beyond. In addition to the regulatory update highlights presented by the […]
Read articleU.S. EPA Processes Renewable Fuel Standard Small Refinery Exemption Backlog
Posted: November 6th, 2025
November 20, 2025 Update: As of Nov. 7, the U.S. Environmental Protection Agency (EPA) has ruled upon 16 more Small Refinery Exemption (SRE) petitions, granting full exemptions for two, granting partial exemptions for 12, and denying two petitions. Notice of […]
Read article
EHS Considerations in the Paperboard Converting Industry
Posted: October 23rd, 2025
While the process of converting paperboard into corrugated sheets and containers seems rather straightforward, there are a wide array of environmental, health, and safety (EHS) challenges faced when manufacturing these products. As experts in both the converting process and EHS […]
Read article