Emission Characteristics of Formaldehyde from Natural Gas Combustion and Effects of Hood Exhaust in Chinese KitchensZihao Zheng, Hemiao Zhang, Hua Qian, Jingguang Li and Cong LiuE3S Web Conf., 356 (2022) 05080DOI: https://doi.org/10.1051/e3sconf/202235605080