Traffic Noise Pollution Assessment in Major RoadJunctions of Imphal City, Manipur (India)

Abstract

Noise pollution assessment was carried out in selected traffic junctions of Imphal city of Manipur, India. The noise pollution assessment was carried out using noise parameters and indices such as L10, L50, L90, Leq for selected traffic junctions during the different periods of the day, i.e., morning, noon, and evening hours. The study of equivalent noise level (Leq), noise parameters, and various noise indices have enabled the evaluation of the overall traffic noise environment of the city. The traffic noise indices such as traffic noise index (TNI), noise climate (NC), traffic noise pollution level (LNP), noise exposure index (NEI) along with day time (LD), night time (LN) average, and day-night (Ldn) noise levels were assessed for the selected traffic junctions. Moreover, spatial noise mapping was carried out using the geostatistical interpolation technique to evaluate the changes of traffic noise scenarios during the different time zones of the day. The Leq values in few traffic junctions exceeded the required noise standards. The study shows equivalent noise level ranging between 52.2–69.9 dB(A) during the morning (7–10 am), 52.4–69.3 dB(A) during noon (12 noon-2 pm), and 54.6–71.1 dB(A) during the evening (4–7 pm) hours, respectively.

Traffic Noise Assessment in Urban Puducherry, South India

“…The facts were also reported in West Bengal [21] and Assam studies [20] and corroborated our study findings. Both studies attribute a large portion of the noise pollution to the traffic flow on the road network; for the West Bengal study, daytime residential noise levels varied from 53 dB to 76 dB, and for the Assam study, it was 65 dB to 75 dB [20,21].…”

“…According to a study conducted in the Mumbai Metropolitan Area, the industrial zone has less noise than other zones, and within the industrial zone, the areas that are most distant from the city have lower noise limits than all other industrial locations [6]. The facts were also reported in West Bengal [21] and Assam studies [20] and corroborated our study findings. Both studies attribute a large portion of the noise pollution to the traffic flow on the road network; for the West Bengal study, daytime residential noise levels varied from 53 dB to 76 dB, and for the Assam study, it was 65 dB to 75 dB [20,21].…”

“…Due to the significant volume of traffic in the afternoon compared to the morning and evening, an Assam study found that the noise level in commercial areas was in the 80 dB to 90 dB range. [20], and commercial zones exceeded the CPCB limit reported by the Mumbai study [6]. According to a study conducted in the Mumbai Metropolitan Area, the industrial zone has less noise than other zones, and within the industrial zone, the areas that are most distant from the city have lower noise limits than all other industrial locations [6].…”