How many decibels of noise inside a sedan car is acceptable

Generally speaking, the noise inside a small car is below 60dB, 40-60dB belongs to our normal conversation sound. According to GB-1495-2002 in the car (M1 category vehicles) outside the car noise limit of 74dB (A) (decibel).

There is no mandatory standard for interior noise in cars. The former State Bureau of Technical Supervision in January 1, 1998 release and implementation of the "Motor Vehicle Operational Safety and Technical Conditions" in the requirements of the passenger car noise level is not greater than 82 decibels; car drivers should not be greater than 90 decibels of noise sound level next to the ear.

Expanded

In order to reduce the pollution of automobile driving noise, countries and major automobile manufacturers have developed standards to limit automobile noise, its main content includes: the car outside the accelerating noise standards, the car outside the uniform speed driving noise standards, noise standards inside the car, the engine noise standards, noise standards, noise standards, exhaust noise standards and other aspects of the standard (some of which are mandatory standards).

Automobile noise is an important indicator in the identification of automobile manufacturing, it is the most important part of the traffic noise. The noise characteristics of modern automobiles is one of the important symbols to measure the quality of the car. Automobile noise not only causes pollution of the surrounding environment, affecting people's life and work, and the noise inside the car is one of the main factors affecting the comfort of the vehicle.

In order to improve the comfort of the vehicle, the world's major automobile companies have the control of noise as an important research direction, especially the car, the car noise condition is a measure of the grade of one of the standards of the car.

References? Baidu encyclopedia motor vehicle operation safety technical conditions