Researchers from the Aerospace Information Research Institute of the Chinese Academy of Sciences, in collaboration with Chongqing University of Posts and Telecommunications, have developed a high-resolution daily atmospheric carbon dioxide (CO2) dataset covering China from 2016 to 2020. The dataset offers new insights into the spatiotemporal variations of column-averaged dry-air CO2 mole fraction (XCO2). The work is published in the journal Scientific Data.