The impact of noise pollution in urban healthy livings are not well documented and is seen often get less attention than it should. The increasing noise in urban settings must be studied further due ...to its site-specific nature for adoption of appropriate control measures or for better zoning of city's land uses. The present study assessed and evaluated the spatiotemporal variability of noise level and noise pollution indices for Chattogram City Corporation (CCC) in Bangladesh as study area. A total of 123 selected points were uniformly distributed to 41 wards under CCC has been taken as measuring sites. An ArcGIS 10.4 software is used to develop and evaluate the variations in noise descriptor and pollution indices in a graphical format. The study found that irrespective of sources, in general, city dwellers experienced moderately high noise with an average noise level of 75 dBA exceeding the limit values set by the Department of Environment (DoE), Bangladesh, World Health Organization (WHO), American Association of State Highway and Transportation Official (AASHTO) for different land uses individually or in combination. With an exception of few wards located far from major roads and with less population and industries, the city dwellers at 14 wards located in the north west, central and few parts of south belt experienced as high as 80 to 90 dBA based on noise equivalent (Leq), noise climate (NC) and noise pollution level (NPL) indices. The higher NPL of its standard value of 88 dBA is found at 14 wards align with the higher Leq and NC located close to major and urban road networks in CCC, while other 12 wards located in the central belt of the city are also with upper bound of limit values. Based on the results and reviewing the recommendations and standards, only three (3) out of the 41 wards or areas considered are under normally acceptable situation, while 12 wards are under normally unacceptable and the noise levels of the rest locations are clearly unacceptable. An immediate zoning of city's land uses and urban settings are to be taken in the identified wards. The outcomes of this study may assist policy makers, regulatory bodies and local council to adopt appropriate measures to ensure healthy living environment for city dwellers.
•A GIS based spatiotemporal variability of noise assessment has been studied.•Substantial temporal & spatial variabilities of noise descriptors are found.•Residential areas in CCC are surprisingly exposed to the highest noise pollution.•Noise map has been developed to illustrate pollution hots spots sites under CCC.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Rainfall and temperature are two key factors to examine while assessing climate change. Bangladesh has witnessed extremes in rainfall and temperature during the previous few decades, affecting both ...the environment and the agricultural economy. In this study, the ARIMA model is used to predict and forecast rainfall and temperature in Chattogram, Bangladesh from 1953 to 2070 considering seasonal variations. Analyzed data indicated a substantial to a fairly significant upward trend in December, with a slight increase in rainfall between years 2021-2050 and 2050-2070. Rainfall reflects a more dominant rising trend in later parts of the selected four-time series, indicating more rainfall during the Monsoon season. Temperature follows an upward trend with time, the most significant positive trend occurring between 2021 and 2050, and a large negative trend occurring between 2050 and 2070. In the years 2021-2050, the yearly average temperature is expected to drop during the Rabi season. In April, May, July, and October, there is a significant negative connection between rainfall and temperature, meaning that temperatures will rise with less precipitation and vice versa.
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