Abstract
A survey and assessment of noise level with its impact on mill workers were conducted in two Jute Mills of Chittagong city. These industries are highly noise producers; the workers of such mills are highly prone to noise pollution effect, especially hearing problems. Higher noise level in different working sections of the Jute Mill was recorded which includes the siren played, noise from the main entrance, mill’s gate and inside the factory. These high levels of noise are much higher than standard and acceptable noise level. The hearing loss of mill workers were determined by producing artificial noise from various distances (5 to 200 feet) and the listening power of different workers was measured. Workers having longer working periods (from 6 months to 2, 5, 10 and 20 years) were not able to hear noise as compared to a normal or less working period person (6 months or new). The experiment suggests that the workers are obviously affected by high noise production of the mills and gradually losing their ability to listen. Key words: Noise pollution, hearing loss, jute mills.
Highlights
Sound is a form of energy which gives the sensation of hearing and is produced by longitudinal mechanical waves in matter including solid, liquid and gases and transmitted by oscillations of atom and molecules of matter
When any sound is produced in the environment which is above the limit of human normal hearing capacity, it is called noise pollution (Bhouyain, 2001)
It has been observed that sound level was above the permissible limit in Amin Jute Mills and Gul Ahmed Jute Mills
Summary
Sound is a form of energy which gives the sensation of hearing and is produced by longitudinal mechanical waves in matter including solid, liquid and gases and transmitted by oscillations of atom and molecules of matter. It is produced when an object vibrates, alternatively compressing and expanding the air. Man has a limitation of hearing sound They cannot hear the sound below 1 dB and above 140 dB is harmful for them (Jenkins et al, 1979). When any sound is produced in the environment which is above the limit of human normal hearing capacity, it is called noise pollution (Bhouyain, 2001). The most common categories of hearing loss are mild, moderate, severe and profound
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