Appendix H — Noise Levels and Subjective Evaluation

Table 8.H.1: Allowable upper limit of Outdoor Noise Levels
Source: Noise Pollution (Control) Rules 2006, the Government of the People's Republic of Bangladesh
                                            Upper Limit of Noise Level in dBA LAeq,T
Sl. No.       Category of Zones               Day Time                Night Time
                                        (06:00 AM - 09:00 PM) (09:00 PM - 06:00 AM)
    01         Quiet Zone                            50                           40
    02         Residential Zone                      55                           45
    03         Mixed Use Zone                        60                           50
    04         Commercial Zone                       70                           60
    05         Industrial Zone                       75                           70

Table 8.H.2: Typical Noise Levels Generated by Aircrafts
Source: Noise Levels for U.S. Certified and Foreign Aircraft, Advisory Circular-AC
No: 36-1H, U.S. Department of Transportation, Federal Aviation Administration, 2012
    Sl. No.       Aircraft Manufacturer and        Flyover Noise Levels with Take-off
                             Model                        Thrust (EPN dBA)a
               (Arranged in an alphabetical order)
         01          Airbus A300                                          103.1
         02          Airbus A380                                           98.1
         03          Boeing 707                                           108.3
         04          Boeing 717                                            92.1
         05          Boeing 727                                           105.8
         06          Boeing 737                                           105.3
         07          Boeing 747                                           107.8
         08          Boeing 757                                           100.3
         09          Boeing 767                                           103.0
         10          Boeing 777                                           101.3
         11          Boeing 787                                            99.6
         12          Lockheed L-1011                                      103.3
         13          McDonnell Douglas DC-08                              102.7
         14          McDonnell Douglas DC-10                              106.6
a
 Noise is measured at 1.2 m above the ground for aircrafts flying overhead at a height
of 450 m from the ground with takeoff thrust. The highest noise level among different
variations in the same model is listed.

Table 8.H.3: Subjective Evaluation and Pressure Levels of Familiar Sounds

                                                          Subjective  Pressure
                    Description of Sound
                                                          Evaluation Level (dBA)

Near jet engine                                                          140
Threshold of pain                                         Deafening      130

Threshold of feeling hard rock band                                      120

   Accelerating motorcycle at a few metre away (Note: 15                 110
   m from motorcycle equals noise at about 600 m from a
                                                         Very loud
   4-engine aircraft)

Full orchestra, loud passage                                             95

Noisy urban street, noisy factory                         Loud           90

School cafeteria                                                         80

Loud speech, 1 m distant; stenographic room               Moderate       70

Near freeway auto traffic                                                60

Conversational speech, 1 m distant; average office                       50

   Attentive theatre audience, total sound. Soft radio Faint             40
   music in apartment.

Faint whisper, 1 m distant; average residence without                    30
stereo playing

Average whisper                                                          20

Rustle of one program, 8 m distant                        Very faint     15

Rustle of leaves in wind; human breathing                                10

Threshold of audibility                                                     0