An XGBoost-GAN framework for mapping PM2.5 and NO2 and exploring land-use scenarios in the Sichuan Basin - Junpai Chen; Yuxuan Tian; Junjie Yin; Xiaojing Zhu; Chenshuo Ma; Hao Zheng; Philip K. Hopke; Yuanxun Zhang (Land Use Policy, 2026)