Atmospheric Chlorine Wet Deposition in China: National Decreases but Localized Increases in Urban Agglomerations

We compiled data from the network and 246 published studies to establish China's first long-term dataset of atmospheric Cl wet deposition from 1990 to 2020. Utilizing an optimized random forest model incorporating multi-source environmental factors, we generated a national Cl wet deposition grid dataset at 0.1° × 0.1° resolution for 2000–2020.