Incidents involving pesticide use with negative repercussions on human health and the environment regularly occur. While poisoning incidents involving humans are more frequently reported, data related to environmental incidents are comparatively scarce. This report provides a brief overview of the situation and it highlights, based on wideranging examples, some of the main challenges related to the detection, monitoring, and reporting of environmental incidents and the determination of their causes. The report also identifies actions that can be taken to address these challenges and types of technical support that can be provided by the Rotterdam Convention and others. Parties to the Rotterdam Convention are encouraged to use this document as an entry point to exchange information with other parties and to engage with the Convention Secretariat for discussion of their specific needs for prevention of environmental incidents with pesticides.