Colorado Finalizes Landfill Methane Reduction Rule
Posted: March 5th, 2026
Author: Brian Taylor On December 18, 2025, the Colorado Air Quality Control Commission (AQCC) approved the Colorado Department of Public Health and Environment (CDPHE), Air Pollution Control Division’s (Division) proposed rule establishing requirements for methane emissions reductions from municipal solid […]
Read articleColorado Public Protections From Toxic Air Contaminants
Posted: March 5th, 2026
Author: Clayton Queen Colorado is implementing big changes for facilities emitting toxic air contaminants (TAC). In June 2022, the Colorado State Assembly passed HB22-1244 (Public Protections From Toxic Air Contaminants), which directed Colorado Public Health & Environment (CDPHE) to implement […]
Read articleProposed Changes to the Risk Management Program: Common Sense Approach to Chemical Accident Prevention
Posted: March 5th, 2026
Author: Christine Silverman Regulatory Intent and Direction On February 24, 2026 the United States Environmental Protection Agency (U.S. EPA) published a proposed rule in the Federal Register that would revise elements of the 2024 Safer Communities by Chemical Accident Prevention […]
Read articleU.S. EPA Finalizes Combustion Turbine NSPS Revisions
Posted: January 27th, 2026
Author: Caleb Fetner 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 […]
Read article2026 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 article2026 Air Quality Look Ahead
Posted: January 14th, 2026
Author: Amy Marshall 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 […]
Read articleSCAQMD Permitting 101: What Industrial Facilities Need to Know (and Do) Before They Apply
Posted: January 8th, 2026
Author: Kelvin Lu 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 […]
Read articleU.S. EPA Finalizes Oil and Gas Compliance Deadline Extension
Posted: January 8th, 2026
Author: Ashley Brooks 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 […]
Read articleU.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
Author: Stewart McCollam 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 […]
Read articleA Presidential Exemption for the Coke Ovens Rules
Posted: December 4th, 2025
Author: Dustin Snare 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 […]
Read article