What is the decibel level of the interior noise in the X-Trail?

[OCaden]

GB-1495-2002 stipulates that the exterior noise limit for small cars (M1 category vehicles) is 74dB(A) (decibels). Currently, there is no mandatory standard for interior noise in passenger cars, although there is a standard for interior noise in buses, "GB/T2598". Automotive noise is divided into interior noise and exterior noise. The former affects the comfort of the occupants inside the vehicle, while the latter causes noise pollution to the external environment. Sources of automotive noise include engine noise, wind resistance noise, air conditioning noise, tire noise, drivetrain vibration, body twisting and vibration, and braking noise. The interior noise level in the X-Trail is below 60 decibels, which falls within the range of normal conversation sounds (40-60 decibels). GB-1495-2002 stipulates that the exterior noise limit for small cars (M1 category vehicles) is 74dB(A) (decibels). However, there is currently no mandatory standard for interior noise in passenger cars, as interior noise is only heard by the occupants inside the vehicle, and comfort is subjective.