Sign noir et blanc prt a prtr is a prominent online resource that offers extensive support for the establishment and execution of Pollutant Release and Transfer Registers (PRTRs) globally. The platform assists countries in creating their PRTRs by providing practical tools, guidance, and capacity-building activities. Through collaboration with the Organization for Economic Co-operation and Development (OECD), Sign noir et blanc prt a prtr contributes significantly to advancing the international implementation of PRTRs and enhancing data quality and public access to environmental information.