You can negotiate with the merchant first. If negotiation fails, you can complain or sue. Article 81 of China's Law on the Prevention and Control of Air Pollution stipulates: "Catering service operators who discharge lampblack shall install lampblack purification facilities and keep them in normal use, or take other lampblack purification measures to discharge lampblack up to standard to prevent pollution to the normal living environment of nearby residents. It is forbidden to build, rebuild or expand catering service projects that produce oil smoke, odor and waste gas in residential buildings, commercial and residential buildings and commercial floors adjacent to residential floors in commercial and residential buildings without special flues. No unit or individual may barbecue food in the open air or provide a venue for barbecue food in the area prohibited by the local people's government. "

legal ground

Article 81 of the Law of People's Republic of China (PRC) on the Prevention and Control of Air Pollution, catering service operators who discharge lampblack shall install lampblack purification facilities and keep them in normal use, or take other lampblack purification measures to discharge lampblack up to the standard to prevent pollution to the normal living environment of nearby residents. It is forbidden to build, rebuild or expand catering service projects that produce oil smoke, odor and waste gas in residential buildings, commercial and residential buildings and commercial floors adjacent to residential floors in commercial and residential buildings without special flues. No unit or individual may barbecue food in the open air or provide a venue for barbecue food in the area prohibited by the local people's government.