Air pollution is considered as a threat to the environment in the developing countries. This study aims to quantify the concentration of PM 2.5 with relation to mode of transportation in the different areas of the Dhaka city. For this, the concentration of PM 2.5 was measured in ambient air with Ecotech Mini 2.5 Sampler and traffic volume survey was conducted in 12 sites across the city in August 2017. The study found that PM 2.5 concentrations in mixed and motorized areas were on average higher than non-motorized and vehicle-free area. The maximum concentration of PM 2.5 was found in Mirpur-10 (172.2 g/m 3 ) while minimum concentration was in B.C. das street (40 g/m 3 ). 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.
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A 2019 study studied this question.