According to the "People's Republic of China (PRC) City Regional Noise Standard", the state has clearly defined the maximum limits of environmental noise in five urban areas:
1. Sanatorium area, senior villa area and senior hotel area: the maximum limit is 50 decibels during the day and 40 decibels at night.
2. Areas dominated by houses, cultural and educational institutions: the maximum value is 55 decibels during the day and 45 decibels at night.
3. Residential, commercial and industrial mixed zone: the maximum limit is 60 decibels during the day and 50 decibels at night.
The above contents are for reference. If specific problems need to be solved, it is recommended to consult relevant personnel of the environmental protection department.