ChinaHighO3: Big Data Seamless 1 km Ground-level MDA8 O3 Dataset for China (2000-Present)

ChinaHighO₃ is one of the series of long-term, full-coverage, high-resolution, and high-quality datasets of ground-level air pollutants for China (i.e., ChinaHighAirPollutants, CHAP). It is generated from big data (e.g., ground-based measurements, satellite remote sensing products, atmospheric reanalysis, and model simulations) using artificial intelligence by considering the spatiotemporal heterogeneity of air pollution. 

This is the big data-derived seamless (spatial coverage = 100%) daily, monthly, and yearly 1 km (i.e., D1K, M1K, and Y1K) ground-level maximum 8-hour average (MDA8) O₃ dataset in China from 2000 to the present. This dataset yields a high quality with a cross-validation coefficient of determination (CV-R²) of 0.89, a root-mean-square error (RMSE) of 15.77 µg m^-3, and a mean absolute error (MAE) of 10.48 µg m^-3 on a daily basis.

If you use the ChinaHighO₃ dataset for related scientific research, please cite the corresponding references (Wei et al., RSE, 2022; Yang et al., RSE, 2025):

• Wei, J., Li, Z., Li, K., Dickerson, R., Pinker, R., Wang, J., Liu, X., Sun, L., Xue, W., and Cribb, M. Full-coverage mapping and spatiotemporal variations of ground-level ozone (O₃) pollution from 2013 to 2020 across China. Remote Sensing of Environment, 2022, 270, 112775. https://doi.org/10.1016/j.rse.2021.112775

• Yang, Z., Li, Z., Cheng, F., Lv, Q., Li, K., Zhang, T., Zhou, Y., Zhao, B., Xue, W., and Wei, J. Two-decade surface ozone (O₃) pollution in China: enhanced fine-scale estimations and environmental health implications. Remote Sensing of Environment, 2025, 317, 114459. https://doi.org/10.1016/j.rse.2024.114459

More CHAP datasets of different air pollutants can be found at: https://weijing-rs.github.io/product.html