ChinaHighNO2: TROPOMI 5 km Ground-level NO2 Dataset for China

ChinaHighNO₂ 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 the 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 TROPOMI-derived 5 km (≈ 0.05°) monthly and yearly ground-level NO₂ products in China in 2019. This dataset yields a high quality with a cross-validation coefficient of determination (CV-R²) of 0.87 and a root-mean-square error (RMSE) of 6.36 µg m^-3 on a daily basis. <strong>Note that this dataset is closed access since a longer-term, seamless, high-resolution (1 km), and higher quality ChinaHighNO₂ dataset (Version 1) is available at: https://doi.org/10.5281/zenodo.6622056</strong> <strong>More CHAP datasets of different air pollutants can be found at: https://weijing-rs.github.io/product.html</strong>ChinaHighNO₂是中国区域地面大气污染物系列长期、全覆盖、高分辨率、高质量数据集（即ChinaHighAirPollutants，简称CHAP）中的一款数据集。该数据集依托地面观测、卫星遥感产品、大气再分析资料与模式模拟等大数据，结合空气污染的时空异质性，通过人工智能方法生成。本数据集为2019年中国区域基于TROPOMI传感器的5km（≈0.05°）分辨率逐月、逐年地面NO₂产品。该数据集质量优异，日尺度下的交叉验证决定系数（cross-validation coefficient of determination，CV-R²）达0.87，均方根误差（root-mean-square error，RMSE）为6.36 µg·m⁻³。**请注意，本数据集为受限获取数据集，更长时序、无缝覆盖、1km分辨率且质量更优的ChinaHighNO₂数据集（版本1）可通过以下链接获取：https://doi.org/10.5281/zenodo.6622056** **更多不同大气污染物的CHAP系列数据集可访问以下链接：https://weijing-rs.github.io/product.html**