Limited Industrial District
| FREQUENCY BANK CYCLES PER SECOND | SOUND PRESSURE LEVEL IN DECIBELS |
| 20–75 | 65 |
| 150–150 | 50 |
| 150–300 | 44 |
| 300–600 | 38 |
| 600–1,200 | 35 |
| 1,200–2,400 | 32 |
| 2,400–2,800 | 29 |
| 4,800–9,600 | 26 |
| TYPE OF OPERATION OF CHARACTER OF NOISE | ADJUSTMENT IN DECIBELS |
| Noise source operates less than 20% of the time | +5 |
| Noise source operates less than 5% of the time | +10 |
| Noise source operates less than 1% of the time | +15 |
| Daytime operations only | +5 |
| Noise of impulsive character (hammering, etc.) | -5 |
| Noise of periodic character (hum, screech, etc.) | |
Limited Industrial District
| FREQUENCY BANK CYCLES PER SECOND | SOUND PRESSURE LEVEL IN DECIBELS |
| 20–75 | 65 |
| 150–150 | 50 |
| 150–300 | 44 |
| 300–600 | 38 |
| 600–1,200 | 35 |
| 1,200–2,400 | 32 |
| 2,400–2,800 | 29 |
| 4,800–9,600 | 26 |
| TYPE OF OPERATION OF CHARACTER OF NOISE | ADJUSTMENT IN DECIBELS |
| Noise source operates less than 20% of the time | +5 |
| Noise source operates less than 5% of the time | +10 |
| Noise source operates less than 1% of the time | +15 |
| Daytime operations only | +5 |
| Noise of impulsive character (hammering, etc.) | -5 |
| Noise of periodic character (hum, screech, etc.) | |