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🌍EPA Proposes Amendments to Emissions Standards for Turbines

On December 13, 2024, the U.S. Environmental Protection Agency (EPA) proposed amendments to the new source performance standards (NSPS) for new, modified, and reconstructed stationary combustion turbines and stationary gas turbines. The EPA is reopening the public comment period for this proposed rule to allow additional time for stakeholders to review and comment on the proposal. The initial 90-day public comment period, which ended March 13, 2025, is being reopened for an additional 21 days, from March 25, 2025 to April 15, 2025.

🌎Proposed EPA Regulations on Ethylene Oxide Emissions Standards

The Environmental Protection Agency (EPA) is proposing to establish a new area source category to address chemical manufacturing process units (CMPUs) using ethylene oxide (EtO). The EPA is proposing to list EtO in table 1 to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Chemical Manufacturing Area Sources (referred to as the CMAS NESHAP in this document) and to add EtO- specific requirements to the CMAS NESHAP. The EPA is also proposing to add a fenceline monitoring program for EtO. In addition, the EPA is proposing new requirements for pressure vessels and pressure relief devices (PRDs). This proposal also presents the results of the EPA's technology review of the CMAS NESHAP as required under the Clean Air Act (CAA). As part of this technology review, the EPA is proposing to add new leak detection and repair (LDAR) requirements to the CMAS NESHAP for equipment leaks in organic HAP service and heat exchange systems. The EPA is also proposing performance testing once every 5 years and to add provisions for electronic reporting. We estimate that the proposed amendments to the CMAS NESHAP, excluding the proposed EtO emission standards, would reduce hazardous air pollutant (HAP) emissions from emission sources by approximately 158 tons per year (tpy). Additionally, the proposed EtO emission standards are expected to reduce EtO emissions by approximately 4.6 tpy.

🏥New Air Toxics Standards for

🌊Impact of New California Harbor Craft Emission Regulations

The Environmental Protection Agency ("EPA") is providing notice of its decision to partially grant the California Air Resources Board's ("CARB's") request for an authorization of amendments adopted in 2022 to its Commercial Harbor Craft ("CHC") regulation (the "2022 CHC Amendments"). EPA's decision was issued under the authority of section 209 of the Clean Air Act ("CAA" or "Act").