Tag: noise pollution

Recent Articles – IJES

Working in Noise Environment: An Investigation of Hearing Quality of Drivers in Morogoro Municipality, Tanzania
Author(s)- Mary S. Gaganija, Stelyus L. Mkoma Happy F. Kiumbu

ABSTRACT

The present study has been carried out to assess the hearing quality of commuter bus and taxi drivers in the fast growing Municipality of Morogoro, Tanzania. The study utilized a structured questionnaire and was carried out among 160 drivers randomly selected in August and September 2010. The questionnaire included questions regarding the self-assessment of the drivers about their hearing ability, past and present exposure to loud sound and the use of noise protective gears. The questionnaire was filled up by the respondents at a close supervision and the data were analysed using simple descriptive statistics. The results show that most divers aged below 35 years and have been exposed to the traffic noise environment for 2 to 5 years. Nearly 4% of the respondents felt that their hearing ability was below average and complained of regular tinnitus. The results also show that only 17.5% used noise protective gears and that too, not often. Reasons for non-usage of protective gears (earplugs, earmuffs and canal caps) included awareness (24.4%), non-availability (50%), personal dislike (8.1%) and headache caused by its use (17.5%). Large percent (82.5% of the drivers did not use any method to reduce exposure to noise, while remaining used fingers or hands at time of loud noise to avoid noise exposure. The self-assessment of hearing by the commuter bus and taxi drivers in Morogoro Municipality suggests that most of the drives have normal hearing. However, this study suggests a systematic study with audiometry of these population groups be carried out in future.

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Recent Articles- IJES

The Effect of Pure and Mixed Plantations of Robinia Pseudoacasia and Pinus Eldarica on Traffic Noise Decrease
Author(s)- Hosseini S. M, Maleki K, Nasiri P

ABSTRACT

This research was conducted to determine the effect of three different plantation types including pure and mixed plantations of Robinia pseudoacasia and Pinus eldarica on noise pollution reduction in Chitgar forest park of Tehran. A point source of noise was positioned in front of each plantation type and the noise level at different distances was measured with a noise meter. Noise values were taken at four measurement points; open area as control treatment (without trees), the urban forests of pure stands of Pinus eldarica and Robinia pseudoacasia and mixed stand and at 7 various distances (10, 20, 30, 40, 50, 75,100m from the noise source, behind tree stands) and 5 repetitions. Among the measured points, mixed stands had the best effect on noise pollution reduction which was about 16.91 dB (A) (decibel) in the distance of 100 meters and up to the permitted level. Noise level reduction was 15.77 dB (A) 50 meter away from noise source within the same stand. Regarding to the negligible difference between the noise reduction effectiveness of these two distances and some limitations to develop urban forests, the tree belts with 50 meters width is recommended to reduce the noise pollution to its standard size.

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