Pollen exposure and mild allergy: A multi-city study in China - Shihan Zhen; Zhouxin Yin; Jiahao Duan; Qian Li; Haolong Pei; Qingyao Wu; Qian Li; Yanhui Zhang; Haijian Zhang; Naiyue Chen; Fengchao Liang (Journal of Hazardous Materials, 2025)