The central business district refers to a prosperous area where businesses are concentrated. The standard value of environmental noise in these two areas is 60 decibels during the day and 50 decibels at night. Therefore, the noise level exceeds 50 decibels at night and 60 decibels during the day, which has already formed a noise nuisance.

Legal basis:

People's Republic of China (PRC) Environmental Noise Pollution Prevention Act

Article 42 Commercial enterprises that use fixed equipment to cause environmental noise pollution in urban areas where noise-sensitive buildings are concentrated must, in accordance with the regulations of the competent department of ecological environment in the State Council, report to the competent department of ecological environment of the local people's government at or above the county level the status of the equipment that causes environmental noise pollution and the facilities for preventing and controlling environmental noise pollution.

Article 43 The boundary noise of newly-built commercial cultural and entertainment places must meet the environmental noise emission standards stipulated by the state; Do not meet the national environmental noise emission standards, the cultural administrative department shall not issue a cultural business license, and the market supervision and management department shall not issue a business license.

Managers of cultural and entertainment venues in operation must take effective measures to make their boundary noise not exceed the environmental noise emission standards prescribed by the state.