Background NOISE Levels Generated by various activities and areas
| Decibels | |
|---|---|
| 0 | Threshold of audibility (acute hearing) |
| 15 | Average threshold of hearing |
| 25 | Whisper at 5 feet, Private House (Sleeping) |
| 30 | Churches, auditoriums (empty), Lecture rooms, assembly halls, conference venues, Conference rooms, seminar rooms, tutorial rooms, Drama studios, Music studios, concert halls, Private House (recreation) |
| 35 | Private residences, Professional & administrative Offices, Private Offices |
| 40 | Libraries, museums, Audio-visual areas, Computer Rooms (teaching), design offices, Drafting offices, Reception areas, Restaurants |
| 45 | Computer rooms (working), Corridors & Lobbies, Airport terminals, Hotel bar |
| 50 | Quite restaurant |
| 55 | Draper’s Shop |
| 60 | General Office |
| 65 | Average restaurant (occupied) |
| 70 | Large mechanized office |
| 75 | Very noisy restaurant |
| 80 | Factory machine shop |
| 85 | Tramcar, tube train |
| 90 | Noisy factory, engine room |
| 95 | Aircraft cabin |
| 100 | Ship’s siren at 100 feet |
| 110 | Boiler Plate construction shop |
| 120 | Aero engine at 30 feet |
| 130 | Threshold of painful feeling in ears |
Note: Decibel is the unit of sound