An integrated dataset of PM2.5, elevation, and meteorological variables over China at a 10-km resolution (2000-2023)

The dataset integrates high-quality data products from multiple heterogeneous sources, including the China High Resolution High Quality PM2.5 dataset (CHAP), the China Regional Ground Meteorological Element Driven Dataset (CMFD V2.0), and a digital elevation model generated based on the Open Elevation API. In the process of creating the dataset, a spatial grid of 0.1 °× 0.1 ° (approximately 10km) within the Chinese region is pre-set as the standard reference grid, and the original annual meteorological grid data is split into daily scale files to unify the time granularity.

In terms of spatial alignment, the 1km resolution CHAP PM2.5 data is resampled to the reference grid through nearest neighbor interpolation, and the elevation data corresponding to the latitude and longitude of the reference grid is matched using the Open Elevation API. The aligned PM2.5 concentration, elevation data, and 11 meteorological variables are merged to generate a daily standardized NetCDF file. Compared to version 1, version 2 further performs spatial interpolation to fill in missing PM2.5 grids within the effective coverage range of meteorological variables.