An effective health intervention: Noise reduction by noise enclosure design

Noise pollution is one of the most important and most common adverse factors which threatening the health of people, especially for workers in industries. Noise induced hearing loss (NIHL), physiological effects and psychological effects are of the most serious threats Caused by noise exposure. This research seeks to repeated complaints of workers and to reduce the noise exposure was conducted at four stations. This interventional study was conducted in two stages. In the first phase, audiometric and noise frequency analysis was conducted to assess the current status and then a noise control through noise enclosure as the most appropriate solution was selected and implemented. Audiometric results showed that In 4000 and 6000 Hz frequency hearing threshold level was greater than 25 dB at all stations, as well as the sound pressure level was higher than the national occupational exposure limits. With regard to the increase in hearing threshold at 4000 Hz is a sign of the beginning of NIHL then, we conclude that the control measures are essential. Therefore, materials with favorable noise transmission loss were selected and noise enclosure was designed. The results of this study showed that noise enclosure can be used as an effective control measure for controlling the noise is studied industrial setting.