Studies on the Environmental Status of the Heavy Metals of the Road Dust in Dhaka City
Contamination of the environment by heavy metals is a phenomenon of global importance today. Due to high concentration in the environment, heavy metals may enter the food chain from soils and result in health hazards. Accumulation in the street dust is one of the major way through which heavy metals may find their way into soils and subsequently living tissues of plants, animals and human beings . Motorized transportation is one of the major sources of urban air pollution [2,3]. Bangladesh is a developing country in South Asia with a population of 130 million people. It is located between 20º42´ to 26º38´ north latitude and 88º01´ to 92º42´ east longitude. The Department of energy in the Ministry of environment and Forests is responsible for air quality standard has been implemented as part of the environmental conservation rules . Dhaka has a population of 12 million and is known for its low air quality. The number of motorized vehicles in the city was relatively low for long time, but Dhaka has experienced an estimated yearly increase in motor vehicle traffic by almost 9% between 1992 and 1999 .
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