4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.
What You Should Know About CMAS Applicability Testing
Posted: August 21st, 2025
If you are a chemical manufacturer and have been keeping a pulse on the federal air quality rules, you may have heard about the CMAS rule. What is CMAS? It is the National Emission Standards for Hazardous Air Pollutants (NESHAP) […]
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South Coast AQMD Proposed Amended Rule 1107: Key Updates and What You Need to Know
Posted: August 21st, 2025
The South Coast Air Quality Management District (AQMD) is proposing to phase out the use of para-ChloroBenzotrifluoride (pCBtF) and tertiary-Butyl Acetate (t-BAc) in metal coating operations regulated under Rule 1107, with a final prohibition date of July 1, 2029. The […]
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U.S. EPA Proposes a Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards
Posted: August 14th, 2025
Introduction On July 29, 2025, the U.S. Environmental Protection Agency (U.S. EPA) proposed to rescind the 2009 Greenhouse Gas (GHG) Endangerment Finding, which has served as a foundation for regulating GHG emissions from motor vehicles for over a decade. With […]
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U.S. EPA Releases Significant Update to AP-42 Section 2.4 for Solid Waste Landfills
Posted: August 14th, 2025
In May 2025, the United States Environmental Protection Agency (U.S. EPA) released a significant update to AP-42 Section 2.4 for Municipal Solid Waste Landfills and the associated LandGEM model for estimating air emissions from solid waste landfills. AP-42 Section 2.4 […]
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Optimizing Air Emissions Calculations with Digital Solutions: Identifying Air Emissions Templates
Posted: August 7th, 2025
What is an Air Emissions “Template”? Templates are used to group similar emissions calculations within digital solution platforms. The way templates are handled varies depending on the software used, but templates are a common concept and approach across software systems. […]
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New York Proposed Rulemaking – 6 NYCRR Part 253 (Mandatory Greenhouse Gas Reporting)
Posted: August 7th, 2025
The State of New York passed the Climate Leadership and Community Protection Act (CLCPA) in July 2019. This regulation requires the New York State Department of Environmental Conservation (NYSDEC) to evaluate statewide greenhouse gas (GHG) emissions and to promulgate regulations […]
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NESHAP Extensions: A Look at Two Recent Relief Notifications
Posted: August 7th, 2025
Over the last few weeks, the United States Environmental Protection Agency (U.S. EPA) and the White House took actions related to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Coke Oven Facilities and the Hazardous Organic NESHAP, also […]
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Georgia Environmental Protection Division Regulatory and Air Permit Fees Updates
Posted: July 31st, 2025
Georgia Environmental Protection Division (GEPD) has proposed multiple changes and updates that relate to both water and air medias since the beginning of 2025. These changes are in response to U.S. Environmental Protection Agency (U.S. EPA) updating the Per- and […]
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OSWI Redefined: U.S. EPA’s Final Amendments on Waste Combustion Regulations
Posted: July 31st, 2025
On June 30, 2025, the U.S. Environmental Protection Agency (U.S. EPA) announced multiple final amendments to the Other Solid Waste Incinerators (OSWI) standards based on its review of 40 CFR Part 60, Subparts EEEE and FFFF required by Clean Air […]
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Final Tennessee Multi-Sector General Permit for Industrial Stormwater Discharge
Posted: July 31st, 2025
What is the TMSP? The Tennessee Multi-Sector General Permit (TMSP) authorizes industrial stormwater discharges to waters of the State of Tennessee from industrial applicable and covered facilities. The previous TMSP expired on June 30, 2025, and the Tennessee Department of […]
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