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Agency for Meteorology, Climatology and Geophysics, Aichi Air Environment Division, Atmospheric Chemistry Research Group School of Chemistry University of Bristol, Center for Environmental Science in Saitama, China Meteorological Administration, CNR-Institute of Atmospheric Pollution Research, Commonwealth Scientific and Industrial Research Organisation, Department of Applied Environmental Science, Stockholm University, Direccion Meteorologica de Chile, Direcion Nacional del Antartico- Istituto Antartico Argentino, Buenos Aires, Argentina, Environment and Climate Change Canada, Federal Environment Agency Austria, Finnish Meteorological Institute, Fisheries Research Agency, Fraunhofer-Institute for Atmospheric Environmental Research, German Environment Agency, German Meteorological Service, Global Monitoring Laboratory, NOAA, Hong Kong Observatory, Hungarian Meteorological Service, Institute for Nuclear Research and Nuclear Energy, Institute of Environmental Protection - NRI, Instituto Geofisico del Peru, Italian Air Force Mountain Centre, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Japan Agency for Marine-Earth Science and Technology, Japan Meteorological Agency, Korea Meteorological Administration, Kyrgyz National University, Laboratoire des Sciences du Climat et de l'Environnement, Malaysian Meteorological Department, Meteorological Research Institute, National Institute for Environmental Studies, National Institute in Space Research, National Institute of Advanced Industrial Science and Technology, National Institute of Environmental Research, National Institute of Meteorological Research, KMA, National Institute of Public Health and the Environment, National Institute of Water & Atmospheric Research Ltd., National Meteorological Administration, National Research Council, Institute of Atmospheric Sciences and Climate, Osaka University, Physics Institute, Climate and Environmental Physics, University of Bern, Ricerca sul Sistema Energetico - RSE S.p.A., Shizuoka University, South African Weather Service, State Meteorological Agency of Spain, Swiss Federal Laboratories for Materials Science and Technology, Tohoku University, University of Malta, Viet Nam Meteorological and Hydrological Administration, Voeikov Main Geophysical Observatory,

Adelaide Dinoi (ISAC), Ahmad Fairudz Jamaluddin (MMD), Akihiko Murata (JAMSTEC), Alcide di Sarra (ENEA), Andrea Lanza (RSE), Andreas Wolf (UBAA), Angelo Viola (ISAC), Anna Degorska (IOEP), Arlyn Andrews (NOAA), Birgitta Noone (ITM), Casper Labuschagne (SAWS), Christian Plass-Dulmer (DWD), Claudia Calidonna (ISAC), Dagmar Kubistin (DWD), Daisuke Goto (NIPR), Dajeong Lee (KMA), Damiano Sferlazzo (ENEA), Daniel Gullì (ISAC), Daniela Heltai (RSE), David H.Y. Lam (HKO), Doug Worthy (ECCC), Ed Dlugokencky (NOAA), Emilio Cuevas (AEMET), ENYO Kazutaka (JMA), Eunjung Kim (GERC), Florin Nicodim (INMH), Francesco Apadula (RSE), Gaston Torres (DMC), Haeyoung Lee (KMA), Hans-Christen (ITM), Hidekazu Matsueda (MRI), Hisayuki Yoshikawa-Inoue (HU), Hitoshi MUKAI (NIES), Horacio Rodriguez (IAA), Iris Buxbaum (UBAA), Ivano Ammoscato (ISAC), Ivo Kalapov (INRNE), Jiyoung Kim (GERC), Juha Hatakka (FMI), KADONO Koji (JMA), Kieran Stanley (UNIVBRIS), Kirk Thoning (NOAA), Koji Ohno (AICH), Krzysztof Skotak (IOEP), Laszlo Haszpra (ATOMKI), Luciana Vanni Gatti (INPE), Ludwig Ries (UBAG), Luigi Caracciolo di Torchiarolo (IAFMS), Mariantonia Bencardino (IIA), Markus Leuenberger (KUP), Martin Saliba (UMLT), Martin Steinbacher (Empa), Marvic Grima (UMLT), Masao Ishii (MRI), Matthias Lindauer (DWD), Michel Ramonet (LSCE), Mitsuo Toda (SHIZU), Mohan Kumar Sammathuria (MMD), Mutsumi Ishitsuka (IGP), Nahas, Alberth Christian (BMKG), Nguyen Nhat Anh (VNMHA), Nina Paramonova (MGO), Okaem, Tanti Tritama (BMKG), Olivia S.M. Lee (HKO), Paolo Cristofanelli (ISAC), Paul Krummel (CSIRO), Pieter Tans (INSTAAR), Ray Langenfelds (CSIRO), Ronald Spoor (RIVM), SAITO Kazuyuki (JMA), Salvatore Piacentino (ENEA), Shinji Morimoto (TU), Shohei Murayama (AIST), Shuangxi FANG (CMA), Shuji Aoki (TU), Simon O'Doherty (UNIVBRIS), Sylvia Nichol (NIWA), Taejin Choi (KOPRI), Takashi Machimura (OSAKAU), Thomas Trickl (IMKIFU), Thumeka Mkololo (SAWS), Tomohiro Oda (USRA), Toshinobu Machida (NIES), Tsuneo Ono (FRA), V. Sinyakov (KSNU), Wolfgang Spangl (UBAA), Yosuke MUTO (SAIPF), Yousuke Sawa (MRI), Zdzislaw Przadka (IOEP), Zoë Loh (CSIRO), WDCGG; All CO₂ data contributed to WDCGG by GAW stations and mobiles by 2018-10-25, https://doi.org/10.50849/WDCGG_CO2_ALL_2018 (Reference date^*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.