Permissible Noise Limit under WSH (Noise) Regulations

Source: https://sso.agc.gov.sg/SL/WSHA2006-S424-2011

Sound pressure level, dB(A)	Maximum duration per day
82	16 hours
83	12 hours 42 minutes
84	10 hours 5 minutes
85	8 hours
86	6 hours 21 minutes
87	5 hours 2 minutes
88	4 hours
89	3 hours 11 minutes
90	2 hours 31 minutes
91	2 hours
92	1 hour  35 minutes
93	1 hour 16 minutes
94	1 hour
95	48 minutes
96	38 minutes
97	30 minutes
98	24 minutes
99	19 minutes
100	15 minutes
101	12 minutes
102	9 minutes
103	7.5 minutes
104	6 minutes
105	5 minutes
106	4 minutes
107	3 minutes
108	2.5 minutes
109	2 minutes
110	1.5 minutes
111	1 minute
112	56 seconds
113	45 seconds
114	35 seconds
115	28 seconds
116	22 seconds
117	18 seconds
118	14 seconds
119	11 seconds
120	9 seconds
121	7 seconds
122	6 seconds
123	5 seconds
124	4 seconds
125	3 seconds
126 to 127	2 seconds
128 to 129	1 second
130 to 140	<1 second.