Montrose Environmental Group Leads Industry Readiness with Over 30 Projects Ahead of Impending HON MACT Rule.

Montrose Environmental Group is preparing chemical manufacturers for the upcoming Hazardous Organic NESHAP Maximum Achievable Control Technology (HON MACT) regulation with over 30 projects nationwide. The regulation, set to begin in mid-2026, targets hazardous air pollutants emitted by synthetic organic chemical manufacturing and polymer and resin facilities. Montrose offers a full suite of emissions and air testing capabilities, including fenceline monitoring, stack testing, and compliance program development, to help clients meet regulatory requirements and operational goals.

With less than a year until key compliance deadlines, chemical manufacturers are under pressure to act in preparation for the upcoming Hazardous Organic NESHAP Maximum Achievable Control Technology (HON MACT) regulation. Montrose Environmental Group, Inc. (NYSE: MEG) is at the forefront of this effort, currently engaged in over 30 projects nationwide to assist chemical manufacturers in navigating the stringent requirements of the HON MACT rule.

Finalized by the U.S. Environmental Protection Agency (EPA) in 2024, the HON MACT regulation targets hazardous air pollutants emitted by synthetic organic chemical manufacturing and polymer and resin facilities. The rule introduces stricter controls on ethylene oxide (EtO), chloroprene, and other air toxics, aiming to reduce community-wide cancer risks by up to 96% . Key compliance deadlines include July 15, 2026, for fenceline monitoring and EtO control requirements, and July 15, 2027, for corrective actions and broader equipment upgrades.

Montrose Environmental Group offers a comprehensive suite of emissions and air testing capabilities to support clients in meeting these regulatory requirements. These services include fenceline monitoring with both real-time and integrated sampling solutions, stack testing, ambient air quality monitoring, leak detection and repair (LDAR), flare efficiency assessments, and compliance program development. The company's team of scientists and engineers works closely with clients to deliver tailored solutions that meet both regulatory requirements and operational goals.

"HON MACT is one of the most important air regulations in recent history for chemical manufacturers," said Todd Grosshandler, Chief Commercial Officer at Montrose Environmental Group. "With long equipment lead times and limited service capacity, the time to act is now. This rule is part of a broader wave of regulations reaffirming clean air as a basic right. Montrose brings together regulatory expertise, advanced laboratory and testing capabilities, and deployed field teams across a broad geographic footprint to help clients not only meet the rule—but lead the way in environmental responsibility."

Montrose Environmental Group is uniquely positioned to assist chemical manufacturers in preparing for the HON MACT regulation due to its extensive experience and resources. With over 3,400 employees across 100+ locations worldwide, Montrose combines deep local knowledge with an integrated approach to design, engineering, and operations. This enables the company to respond effectively and efficiently to the unique requirements of each project, from comprehensive air measurement and laboratory services to regulatory compliance, emergency response, permitting, engineering, and remediation.

To learn more about how Montrose can support your HON MACT compliance strategy, visit HON MACT Best Practices | Montrose Environmental .

References:
https://www.epa.gov/newsreleases/biden-harris-administration-finalizes-stronger-clean-air-standards-chemical-plants
https://www.stocktitan.net/news/MEG/montrose-environmental-group-leads-industry-readiness-with-over-30-9jmlp7zpsq7w.html