Is it legal to set up restaurant fumes in the residential building on the first floor of the community and discharge them directly into the flue for residents' life?

If you open a restaurant under a residential building and smoke disturbs the people, you can complain and report to the relevant ecological and environmental protection authorities such as the Environmental Protection Bureau and the Urban Management Bureau.

According to the provisions of the People's Republic of China (PRC) Air Pollution Prevention Law:

Article 81 A catering service operator who discharges 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 and 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.

The provisions of the Tort Liability Law of People's Republic of China (PRC):

Article 65 If damage is caused by environmental pollution, the polluter shall bear the tort liability.

Article 66 In the event of a dispute arising from environmental pollution, the polluter shall bear the burden of proof under the circumstances that the liability is not assumed or mitigated according to the law, and there is no causal relationship between the act and the damage.