Advanced leak detection and repair program prevents emissions equal to the work of nearly eight million trees in one year

Global efforts to curb methane emissions are falling short. A recent UN assessment shows current pledges will only achieve an 8% reduction by 2030—far short of the 30% target. While the world struggles to meet its goals, Montrose Environmental Group, Inc. (NYSE:MEG) is proving that meaningful progress is possible.

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Through its advanced methane leak detection and repair (LDAR) program using optical gas imaging (OGI), Montrose is helping clients across North America significantly reduce methane emissions, reinforcing its mission to advance environmental stewardship while supporting economic development.

In 2025 alone, Montrose reduced 201,487 tonnes of carbon dioxide equivalent (CO₂e) in methane from escaping into the atmosphere, equivalent to the annual emissions from about 43,000 cars or the work of nearly eight million mature trees. Methane is 28 times more powerful than CO₂ at trapping heat over 100 years, making it one of the most critical levers for limiting global temperature rise to 1.5°C.

Methane Emissions Impact Metrics

Total leaks detected in 2025: 22,195
Leaks repaired same day: 4,480 or 20%
Estimated carbon dioxide equivalent (CO₂e) captured through repairs: 201,487 tonnes
Number of sites monitored: 2,160

"Cutting methane emissions is one of the fastest, most effective ways to fight rising global temperatures," said Elizabeth McGurk, Methane Sector Lead, Montrose Environmental Group – a contributor to the International Association of Oil & Gas Producers (IOGP) working group, which is currently developing ISO standards that will shape the future of global methane management. "Every leak we detect that is repaired means emissions prevented and climate goals advanced. Montrose's work demonstrates that industry leadership and innovation can deliver measurable results today—not decades from now."

Montrose's impact extends beyond oil and gas refineries. The company supports emerging applications of methane monitoring for liquified natural gas (LNG) tankers, global shipping, landfills and other industrial scenarios, where methane emissions pose significant challenges. Recent strategic partnerships with Intertek and GHGSat further strengthen Montrose's ability to deliver comprehensive solutions—from independent measurement and verification of methane emissions to satellite-based monitoring and regulatory compliance—helping clients meet sustainability targets and regulatory requirements worldwide.

As global headlines warn of missed methane reduction targets, Montrose is charting a different course defined by action, innovation and measurable impact. By combining cutting-edge technology, expert field services and strategic partnerships, Montrose is helping industries lead the way in reducing greenhouse gas emissions, while meeting business growth objectives and building a more sustainable future.

Learn more about how we can help with your fugitive emissions monitoring.

About Montrose

Montrose is a leading environmental solutions company focused on supporting commercial and government organizations as they deal with the challenges of today and prepare for what's coming tomorrow. With ~3,500 employees across 120 locations worldwide, Montrose combines deep local knowledge with an integrated approach to design, engineering, and operations, enabling Montrose 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, Montrose delivers innovative and practical solutions that keep its clients on top of their immediate needs – and well ahead of the strategic curve. For more information, visit www.montrose-env.com. Follow us on LinkedIn.

Forward‐Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements may be identified by the use of words such as "intend," "expect", and "may", and other similar expressions that predict or indicate future events or that are not statements of historical matters. Forward-looking statements are based on current information available at the time the statements are made and on management's reasonable belief or expectations with respect to future events, and are subject to risks and uncertainties, many of which are beyond the Company's control, that could cause actual performance or results to differ materially from the belief or expectations expressed in or suggested by the forward-looking statements. Additional factors or events that could cause actual results to differ may also emerge from time to time, and it is not possible for the Company to predict all of them. Forward-looking statements speak only as of the date on which they are made, and the Company undertakes no obligation to update any forward-looking statement to reflect future events, developments or otherwise, except as may be required by applicable law. Investors are referred to the Company's filings with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended December 31, 2023, for additional information regarding the risks and uncertainties that may cause actual results to differ materially from those expressed in any forward-looking statement.

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Investor Relations

Adrianne Griffin

(949) 988-3383

ir@montrose-env.com

Media Relations

Tammy Hovey

(917) 520-2751

pr@montrose-env.com

While Global Methane Goals Stall, Montrose Environmental Group Helps Clients Significantly Cut Emissions