All factory premises shall abide by the maximum permissible noise limits set by NEA under the Environmental Protection and Management (Boundary Noise Limits for Factory Premises) Regulations. The noise limits become progressively more stringent when the affected premises require more peace and quiet, as well as during the evening and night. For instance, the equivalent continuous noise level from factory premises affecting residential premises must not exceed the noise limit of 70 dBA over any 5-minute period between 7am to 7pm, and must not exceed 65 dBA between 7pm to 11pm.
Boundary noise limits for factory premises
| Types of affected premises | Maximum permissible noise levels (reckoned as an equivalent continuous noise level over the specified period) in decibels (dBA) |
| Day (7am-7pm) | Evening (7pm-11pm) | Night (11pm-7am) |
| Noise Sensitive Premises | 60 | 55 | 50 |
| Residential Premises | 65 | 60 | 55 |
| Commercial Premises | 70 | 65 | 60 |
| Types of affected premises | Maximum permissible noise levels (reckoned as an equivalent continuous noise level over 5 minutes) in decibels (dBA) |
| Day (7am-7pm) | Evening (7pm-11pm) | Night (11pm-7am) |
| Noise Sensitive Premises | 65 | 60 | 55 |
| Residential Premises | 70 | 65 | 60 |
| Commercial Premises | 75 | 70 | 65 |
| Factory Premises | 75 | 70 | 65 |