According to official data, there has been a consistent decline in the noise levels in these areas over the last couple of months. While the decibel (dB) levels are still above permissible limits, Bengaluru’s silent zones are much quieter. While NIMHANS recorded a monthly average noise level of 55 dB during the day and 55.7 dB at night, on Mysore Road, it was 60.4 dB during the day and 56.9 dB at night.