Research on a multi-scale emission factor dataset constructing method Daoyuan Yang, Rui Wu, Xinyu Zhang, Yu Liu, Hanzhengnan Yu, Xianpan An, Kunqi Ma, Yongkai Liang, Hang Xu and Hao Zhang E3S Web of Conf., 536 (2024) 03014 Published online: 10 June 2024 DOI: 10.1051/e3sconf/202453603014