Air Quality

D.C. Circuit Vacates U.S. EPA’s SSM SIP Call

Posted: March 21st, 2024

On March 1, 2024, the U.S. Court of Appeals for the District of Columbia (D.C.) Circuit decided 2 to 1 to vacate the United States Environmental Protection Agency’s (U.S. EPA’s) State Implementation Plan Call with respect to certain startup, shutdown, […]

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Enforcement Alert – BWON

Posted: March 19th, 2024

In February 2024, the United States Environmental Protection Agency (U.S. EPA) Office of Civil Enforcement issued a long expected Enforcement Alert targeting facilities subject to 40 CFR Part 61 Subpart FF – National Emission Standard for Benzene Waste Operations (BWON).  […]

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Now Boarding: Mississippi Facilities to CAERS Version 5

Posted: March 12th, 2024

The United States Environmental Protection Agency (U.S. EPA) Combined Air Emissions Reporting System (CAERS) is officially being rolled out to 11 Mississippi pilot facilities in 2024! U.S. EPA hosted a training in December 2023 with Mississippi Department of Environmental Quality […]

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Lime Manufacturing NESHAP Supplemental Proposal Issued

Posted: March 6th, 2024

A supplemental notice of proposed rulemaking to the 40 CFR Part 63, Subpart AAAAA (National Emission Standards for Hazardous Air Pollutants for Lime Manufacturing Plants [Lime Manufacturing NESHAP]) was published in the February 9, 2024 Federal Register. The U.S. Environmental […]

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Proposed Changes to Project Emissions Accounting (PEA) Regulations

Posted: March 4th, 2024

The U.S. Environmental Protection Agency (EPA) signed proposed changes to the 2020 Project Emissions Accounting (PEA) provisions in the Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NNSR) regulations on February 22, 2024. Collectively, the PSD and NNSR […]

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Annual PM2.5 NAAQS Lowered!

Posted: February 8th, 2024

On February 7, 2024, the United States Environmental Protection Agency (U.S. EPA) made the long-awaited announcement that the annual particulate matter less than 2.5 microns (PM2.5) National Ambient Air Quality Standard (NAAQS) will be lowered from 12 micrograms per cubic […]

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2024 Texas Lookahead

Posted: January 30th, 2024

Texas is a very dynamic state with a robust variety of industries that are faced with unique and cumbersome regulatory requirements.  ALL4 closely follows the actions of the Texas Commission on Environmental Quality (TCEQ) and U.S. EPA Region VI. ALL4’s […]

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2024 Look Ahead Part 3

Posted: January 25th, 2024

2024 Look Ahead: Occupational Health and Safety // Victoria Sparks As we look back on 2023, the Occupational Safety and Health Administration (OSHA) was busy – expanding National Emphasis Programs (NEPs), hiring more inspectors, conducting more inspections, and expanding rules […]

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2024 Look Ahead Part 2

Posted: January 18th, 2024

PFAS Expectations for 2024 // Kayla Turney With the new year, we expect to see several of the same issues relating to per- and polyfluoroalkyl substances (PFAS), as well as a handful of new ones to tackle.  While the regulatory […]

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