Air Quality in Fitness Centers: Status and Improvement Strategies Guozhu Li, Bin Luo, Maolin Liu, Haizhu Xue, Yongzhen Tian, Chong Meng and Linna Xie E3S Web of Conf., 536 (2024) 01017 Published online: 10 June 2024 DOI: 10.1051/e3sconf/202453601017