Abstract
Air pollution is considered a threat to the environment in developing countries. This study aims to quantify the concentration of PM2.5 in relation to the mode of transportation in the different areas of Dhaka city. For this, the concentration of PM2.5 was measured in ambient air with Ecotech Mini 2.5 Sampler and traffic volume survey was conducted in 12 sites across the city on August 2017. The study found that PM2.5 concentrations in mixed and motorized areas were on average higher than non-motorized and vehicle-free area. The maximum concentration of PM2.5 was found in Mirpur-10 (172.2 µg/m3) while minimum concentration was in B.C. das street (40 µg/m3). This study concluded that increasing the number of vehicles is one of the major sources of pollution of air in Dhaka city. Hence, well-developed public transportation service instead of the private car may contribute to reducing the air pollution in Dhaka city.
Highlights
The capital Dhaka located in a central geographical position of Bangladesh that accommodates about 10% of the nation’s population
Since development must keep going in the country, an air pollutant is increasing in the atmosphere with these
Different types of construction activities, diesel run transportation system, trash burning, brick kilns, and industrialization are the major causes of air pollution here (Nayeem, Hossain et al, /American Journal of Pure and Applied Biosciences, 1(4), 12-19, 2019
Summary
The capital Dhaka located in a central geographical position of Bangladesh that accommodates about 10% of the nation’s population. In Bangladesh, ambient and indoor PM2.5 is one of the substantial environmental risk, causing about 21% of all deaths while Bangladesh are the leading country compare to other south Asian countries in terms of air pollution (World Bank, 2018). The economic losses of air pollution could range from a low estimate of $60 million to a high estimate of $270 million, equivalent to 1.7% to 7.5% of the Dhaka’s gross product (Hossain and Easa, 2012). From 2013-2018, the PM2.5 concentrations in Dhaka city was six times greater than the NAAQS of Bangladesh as well as 813 times higher than the WHO guideline value (Rana et al, 2016; DoE, 2019) In this circumstance, we studied air quality parameters (PM2.5) at different locations in the megacity of Dhaka and its relation with modes of transport. The objectives of the study are to determine the variation of PM2.5 concentration between different categories of roads in Dhaka
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