Study on the Characteristics of Formaldehyde Pollution in Typical Teaching Machine RoomPengpeng Yang, Mianwu Meng, Dingding Gao, Zhihao Lin, Hua Ding, Mengke Tian, Chunqiang Chen, Zhenming Zhou, Siyu Huang and Caiyan KangE3S Web Conf., 143 (2020) 02001DOI: https://doi.org/10.1051/e3sconf/202014302001