Experimental study on indoor environment quality in a naturally ventilated classroom of a university using natural ventilation and ventilation fanJie Zong, Wenjun He, Lingna Wang, Hongkai Chai, Yingying Zhao and Jiying LiuE3S Web Conf., 165 (2020) 04082DOI: https://doi.org/10.1051/e3sconf/202016504082