The uploaded files provide supplementary data related to the journal article: Nakamura, Shinichiro. "Tracking the product origins of waste for treatment using the WIO data developed by the Japanese Ministry of the environment." Environmental Science & Technology 54, no. 23 (2020): 14862-14867. https://doi.org/10.1021/acs.est.0c06015 Please, refer to the abovementioned article, particularly the Supporting Information, for further description of the provided data. Specifically, refer to Table S4 for the notation used to represent secondary waste items obtained post-treatment, such as through shredding. For a waste item 'z,' the notation z(k) represents 'z' after undergoing treatment 'k,' as outlined below: (i): after intermediate treatment(d): after dehydration(c): after concentration(s): after shredding(f): after filtration