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.

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Final Updates to the Chemical Manufacturing Area Source Rule

Posted: April 16th, 2026

Author: Philip Crawford On April 1, 2026, the U.S. Environmental Protection Agency (U.S. EPA) finalized changes to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Chemical Manufacturing Area Sources (i.e., CMAS, codified at 40 CFR Part 63, Subpart […]

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Understanding the Final PEPO NESHAP: Key Changes and Implications

Posted: April 7th, 2026

Author: Andrew Kelley & Dayana Flores Granda The U.S. Environmental Protection Agency (U.S. EPA) has finalized updates to the Polyether Polyols (PEPO) Production National Emission Standards for Hazardous Air Pollutants (NESHAP), 40 CFR Part 63, Subpart PPP. PEPO are chemical […]

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Do Your Incident Investigations Measure Up?

Posted: April 7th, 2026

Author: Bruce Armbruster Workplace safety incident investigations of both near misses and serious injuries and fatalities (SIFs) are critical steps in identifying appropriate and effective corrective and preventive actions. High-caliber incident investigations prevent future harm to employees, yet organizations often […]

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SCAQMD Rules 1401 and 1401.1 – Why Do They Matter?

Posted: April 7th, 2026

Author: Michael McHale As discussed in our previous 4 the Record Article on SCAQMD Permitting 101, air quality permitting is often the critical path for facilities looking to implement capital projects in the South Coast Air Quality Management District’s (SCAQMD’s […]

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CARB 2026 California SB 253 Updates

Posted: April 2nd, 2026

Authors: Cambre Codington and Corey Prigent Over the past month, the California Air Resources Board (CARB) has provided additional direction on implementation of the Climate Corporate Data Accountability Act [Senate Bill (SB) 253] through both its February 26, 2026 Board […]

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