Three countries working together to protect our shared environment

International collaboration between Canada, Mexico and the United States on environmental issues of common interest

In the Spotlight

Join the Monarch Blitz’s 10th Anniversary: Every Observation Matters

Tiohtià:ke (Montreal), 23 July 2026—The International Monarch Monitoring Blitz is just around the corner! From 31 July to 9 August 2026, we invite everyone across North America to head outside and search for monarch butterflies and milkweed plants.

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Featured Project

Tracking Pollutant Releases and Transfers in North America

Initiative Active Pollutants

The CEC's North American Pollutant Release and Transfer Register (NAPRTR) Initiative promotes public access to data and information reported by industrial facilities in North America, in order to improve understanding of the sources and management of pollutants of common concern across the region and support decision-making relative to pollution prevention...

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Nuclear power plant - AirNow

Featured Publication

Submissions on Enforcement Matters: What Have We Learned?

A Retrospective Review of Performance

January 9, 2024 99 pages Enforcement

This report assesses the performance and impact of the Submissions on Enforcement Matters (SEM) process from 1994 through 2021. The SEM process allows persons and nongovernmental organizations to file submissions with the Commission for Environmental Cooperation asserting that Canada, the United States of America, or Mexico is failing to effectively enforce its environmental laws and provides procedures for developing information concerning the asserted enforcement matters. The SEM process operated under the North American Agreement on Environmental Cooperation (NAAEC) from 1994 to June 2020 and now operates under the US-Mexico-Canada Agreement (USMCA/CUSMA) since July 2020. This report considers the objectives of the SEM process, its legal foundations, its implementation over time, and its results. The report considers the role of the process in promoting transparency, accountability, and public participation, as well as whether it has met its expected environmental objectives.

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SEM long-term impact assessment

What We Do

We conduct research, provide tools and training, and provide a unique space for decision-makers and the public to engage on environmental policy issues affecting the North American region.

About the CEC