UNECE has negotiated five environmental treaties, all of which are now in force:

• Convention on Long-range Transboundary Air Pollution;
• Convention on Environmental Impact Assessment in a Transboundary Context;
• Convention on the Protection and Use of Transboundary Watercourses and International Lakes;
• Convention on the Transboundary Effects of Industrial Accidents; and
• Convention on Access to Information, Public Participation in Decision-making and Access to Justice in Environmental Matters.

Their governing bodies are serviced by the UNECE secretariat, which also helps them to monitor the implementation of the treaties.