Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Environmental Engineering Air and Noise Pollution
According to 1S4954:1968, the usual noise level of the industries is in the order of:
1
130 to 165 decibels
2
170 to 210 decibels
3
105 to 130 decibels
4
60 to 95 decibels