| Sound | Intensity Level (decibels) |
|---|---|
| Threshold of human hearing | 0 |
| Whisper | 15-20 |
| Normal conversation | 40-50 |
| Street noise | 60-70 |
| Inside a bus | 90-100 |
| Operating heavy machinery | 80-120 |
| Rock concert (in audience) | 110-120 |
| Threshold of pain | 120 |
| Jet plane (taking off) | 120-160 |