Organized by:
Supporting Organizations:

 

Print version










AIR POLLUTION: A CASE STUDY OF DHAKA CITY
Dil Afroza Begum Bangladesh University of Engineering and Technology

ABSTRACT

Dhaka, the capital of Bangladesh is one of the largest cities of the world. It is expanding very rapidly. Although the number of motor vehicles per thousand people in Dhaka City is still low, very high population, poorly maintained motor vehicles and severe traffic congestion contribute the high level of pollution here. In recent years, several studies on air pollution have been conducted by the different organizations of Bangladesh. This paper presents the salient features of those studies. The results of the investigations have revealed the following points: Most of Sulfur Dioxide in the ambient Dhaka air originates from the Sulfur present in Diesel. The concentration of SPM, CO, CO2 and NOx in the ambient air exceeds the standard values set by the Department of Environment of the Govt. of Bangladesh at several points of heavy traffic congestion. However, the concentration of CO. NOx and SOx in the air of residential areas of Dhaka city is not alarming. The concentration of PM2.5 and PM10 in the air of Dhaka city is alarming during winter season. Of all the heavy-duty vehicles, double-decker busses emit the lowest smoke emissions. About 74% of double-decker busses emit free acceleration smoke lower than 65 HSU compared to only 41% of the single-decker busses. Trucks, light and medium duty vehicles were the most polluters. More than half of these vehicles have smoke emissions greater than 90 HSU. The CNG vehicle both the cars and three wheelers have seen in general to low emitters of idle CO and Hydrocarbon. On the basis of the results of the investigations some recommendations have been suggested in the paper to mitigate air pollution problem of Dhaka City.

BAQ 2004 Secretariat at [email protected] Fax: 00 632 636 2381