Sound Insulation
| Source | Noise Level (dB) |
| Airport Noise | 120 - 130 |
| Railways Noise | 100-110 |
| Street Noise | 80-90 |
| Different Disturbing Noise Sources | 70-85 |
| Measuring (dB) | Type | Source |
| 120 -130 | High Frequencies | Aircraft Engine |
| 100 - 110 | High Frequencies | Train Arriving |
| 80 - 90 | Low Frequencies | Car Hooter |
| 70 - 85 | Mixed Frequencies | People Speaking Loudly |
| 45 - 55 | Quiet Apartment | |
| 10 - 0 | Desert Silence | |
| 0 | Absolute Quite |