How many decibels below the soundproof window is noise? How many decibels above affect normal rest?

People's Republic of China (PRC) city regional environmental noise standard.

Level 0, 50 decibels, 40 decibels

1 class 55db 45db

Level 2 60 dB 50 dB

Level 3, 65 decibels, 55 decibels

Category 4: 70 dB and 55 dB

Scope of application of various standards:

(1) Level 0 standard is applicable to areas that need to be quiet, such as convalescent areas, senior villa areas and senior hotel areas. Such areas located in suburbs and rural areas shall be implemented according to the standard of 5 dB stricter than Class 0.

(2) The1class standard is applicable to areas with residential, cultural and educational institutions as the mainstay. Rural living environment can be implemented with reference to such standards.

(3) Level 2 standard is applicable to residential, commercial and industrial mixed areas.

(4) Level 3 standards are applicable to industrial zones.

(5) The four-level standard is applicable to the areas on both sides of urban road traffic trunk lines and the areas on both sides of inland waterways passing through urban areas. This kind of standard is also applicable to the limits of background noise (which refers to the noise level of outdated trains) on both sides of the main and secondary lines of railways passing through cities.

Sudden noise at night:

The maximum value of sudden noise at night shall not exceed the standard value 15 dB.

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