You can report the issue by calling the Taipei Citizen Hotline at 1999, and the Environmental Protection Bureau will dispatch staff to investigate. Since cooking fumes (odors) are considered a sensory pollutant, it’s important to leave your contact information and address when filing the complaint. This will allow the staff to schedule an inspection at your location, improving the efficiency and accuracy of the investigation.
Source: Environmental Inspection Division, Department of Environmental Protection, Taipei City Government