ASHES webinar series recording:
WHO’s Clean Household Energy Solutions Toolkit (CHEST), specifically the ‘Guidance on Standards and Testing’ module
These voluntary performance targets are provided as informative guidance, and are not intended as normative requirements for the testing of cookstoves. Performance targets can be considered as an approach to benchmarking potential performance of cookstoves and clean cooking solutions, and provide guidance to help organizations and countries with international collaboration and trade in household energy technologies, fuels, and related products.
Find the standard here: https://www.iso.org/standard/73935.html