According to national standards, the noise in residential areas should not exceed 50 decibels during the day and should be lower than 45 decibels at night. If it exceeds this standard, it will cause harm to the human body. So, what is the noise standard of indoor environment? The fourth paragraph of Article 5 of the National Method for Measuring Environmental Noise in Urban Areas stipulates that when measuring noise indoors, the indoor noise limit is lower than the standard value of the area where it is located, that is, 10dB.

Code for Residential Design (GB50096-20 1 1) stipulates: [4]

6. 10. 1 Stores, workshops and warehouses that store and use Class A and B articles with fire hazards are strictly prohibited in residential buildings, and shops, workshops and entertainment facilities that produce noise, vibration and pollute the environment and sanitation are not allowed.

7.3. 1 The noise level of the bedroom and living room (hall) of the house shall meet the following requirements:

1. The equivalent continuous A sound level in the bedroom during the day should not be greater than 45dB；;

2. The equivalent continuous A sound level in the bedroom at night should not be greater than 37dB；;

3. The equivalent continuous A sound level of the living room (living room) should not be greater than 45dB.

According to the Code for Residential Buildings (GB50368-2005), noise prevention measures should be taken in plane layout and building structure. The allowable noise level of bedroom and living room is 50dB(A sound level) during the day and 40dB(A sound level) when the windows are closed at night.