Supplementary Datasets to "Impact of leakage during HFC-125 production on the increase in HCFC-123 and HCFC-124 emissions" This data repository contains supplmentary datasets to the manuscript "Impact of leakage during HFC-125 production on the increase in HCFC-123 and HCFC-124 emissions" by Western et al., in Atmospheric Chemistry and Physics. There are six supplementary data sets in this folder: 1) factorylocations_2024_translated.pdf contains a translation of production data and companies producing HFC-125 (and other HFCs) in China. The original citation is "Ministry of Ecology and Environment of the People’s Republic of China: 2024 Hydrofluorocarbon Production and Import Quotas Announced [in Chinese], https://www.mee.gov.cn/xxgk2018/xxgk/xxgk05/202402/W020240318587718307908.pdf, 2024". 2) GlobalEmissions.zip contains the global emissions and mole fraction trends derived from the 12-box model used in this work. This is for HCFC-123 and HCFC-124 for both the NOAA and AGAGE networks. Inputs to the 12-box model inversion scripts are also included, which can be found at https://github.com/mrghg/py12box_invert (most recent version). These files are csv files. 3) HCFC124_bank_feedstock_modelling_3_31_2025.mat contains the outputs from the estimation of the separation of HCFC-124 emitted from banks and from HFC-125 production. This is a matlab file, but can be read using free software, such as Python. 4) US_HCFC-124 emissions.zip contains the estimated emissions of HCFC-124 for the USA and files containing information on the observations used to do this. 5) Europe.zip contains netcdf files output from the InTEM and RHIME models that were used to derive European emissions. Each model has 2 netfdf files, one which contains the output emissions and the other the input/output mole fractions. 6) EastAsia.zip contains the output files from the InTEM and RHIME models that were used to derive emissions from East Asia. InTEM outputs are text files and RHIME outputs are netcdf files. The most recent observations from the AGAGE network can be found here and from the NOAA network can be found here.