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<p>This study investigates environmental noise exposure caused by rail crossing alarms and urban traffic in Sreemangal, Bangladesh. Noise levels were measured at the Vanugach Road rail crossing in Sreemangal using the NIOSH Sound Level Meter (SLM) app on an iPhone 14 Pro Max. Recordings were made during train passages at different times of day, one of which included a detailed session at 9:00 PM. The equivalent continuous levels (LAeq) were between 85.6 and 93.1&#xa0;dB, while LCpeak readings were consistently above 114&#xa0;dB. Based on train timetable observations, the crossing is exposed to around 12 such noise events every day, giving a total daily exposure of roughly 120–144&#xa0;min. The estimated 8-h-equivalent dose (113.8%–646%) was derived from measurement of LAeq and total daily duration of exposure observed (approximately 120–140&#xa0;min) in accordance with NIOSH standards (National Institute for Occupational Safety and Health (NIOSH). Criteria for a Recommended Standard: Occupational Noise Exposure&#xa0;(NIOSH Publication No. 98–126). Cincinnati, OH: U.S. Department of Health and Human Services; 1998.). That figure is intended as an average dose relative to a reference period of 8&#xa0;h and does not assume the exposure is constant all day. This case study highlights the high levels of noise exposure experienced by people living near the Sreemangal rail crossing in Bangladesh. In the following analysis, we use ‘residents’ to describe permanent households situated within roughly 50–80 m from the railway crossing. These structures are decades old and have been built unusually close to the rail track in densely populated Bangladesh, where the demand for land often clashes with a limited supply. For most families, relocation is thus implausible. With 12 alarms per day, each lasting 10–12&#xa0;min and producing levels above 93&#xa0;dB, residents are exposed to daily noise that far exceeds international safety limits. The results underline the importance of sustained noise monitoring and stronger policy measures. Without intervention, repeated exposure of this kind will continue to place a burden on public health in semi-urban areas, communities that are often overlooked in environmental planning.</p>

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Noise exposure from rail line crossing alarms and urban Traffic in Sreemangal, Bangladesh: a smartphone-based case study

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Riday Paul

摘要

This study investigates environmental noise exposure caused by rail crossing alarms and urban traffic in Sreemangal, Bangladesh. Noise levels were measured at the Vanugach Road rail crossing in Sreemangal using the NIOSH Sound Level Meter (SLM) app on an iPhone 14 Pro Max. Recordings were made during train passages at different times of day, one of which included a detailed session at 9:00 PM. The equivalent continuous levels (LAeq) were between 85.6 and 93.1 dB, while LCpeak readings were consistently above 114 dB. Based on train timetable observations, the crossing is exposed to around 12 such noise events every day, giving a total daily exposure of roughly 120–144 min. The estimated 8-h-equivalent dose (113.8%–646%) was derived from measurement of LAeq and total daily duration of exposure observed (approximately 120–140 min) in accordance with NIOSH standards (National Institute for Occupational Safety and Health (NIOSH). Criteria for a Recommended Standard: Occupational Noise Exposure (NIOSH Publication No. 98–126). Cincinnati, OH: U.S. Department of Health and Human Services; 1998.). That figure is intended as an average dose relative to a reference period of 8 h and does not assume the exposure is constant all day. This case study highlights the high levels of noise exposure experienced by people living near the Sreemangal rail crossing in Bangladesh. In the following analysis, we use ‘residents’ to describe permanent households situated within roughly 50–80 m from the railway crossing. These structures are decades old and have been built unusually close to the rail track in densely populated Bangladesh, where the demand for land often clashes with a limited supply. For most families, relocation is thus implausible. With 12 alarms per day, each lasting 10–12 min and producing levels above 93 dB, residents are exposed to daily noise that far exceeds international safety limits. The results underline the importance of sustained noise monitoring and stronger policy measures. Without intervention, repeated exposure of this kind will continue to place a burden on public health in semi-urban areas, communities that are often overlooked in environmental planning.