4 The record articles

4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.


HON Fenceline Monitoring – Are You Ready?

Posted: November 2nd, 2023

On April 25, 2023, the U.S. Environmental Protection Agency (U.S. EPA) proposed amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) that apply to the Synthetic Organic Chemical Manufacturing Industry (SOCMI), more commonly referred to as the Hazardous […]

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Michigan Regulates PFAS via NPDES

Posted: October 25th, 2023

On March 14, 2023, the Michigan Department of Environment, Great Lakes, and Energy (EGLE or department) published an interoffice communication summarizing a comparison of the department’s current strategy for using the National Pollutant Discharge Elimination System (NPDES) to regulate the […]

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Proposed Revisions to the “Guideline on Air Quality Models”

Posted: October 24th, 2023

On October 23, 2023, the United States Environmental Protection Agency (U.S. EPA) published a proposed rule to revise 40 CFR Part 51, Appendix W (the “Guideline on Air Quality Models” or “Guideline”). The proposed revisions include enhancements to the formulation […]

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