Abstract: It is a matter of concern for the mega cities in the world especially Dhaka City in Bangladesh that the quality of air is deteriorating in disruptly day by day. Because of growing unplanned urbanization and for implementation mega development projects like metro rail, elevated express way and the establishment of brick fields adjacent to this city etc. For implementing these type of projects, Dhaka’s air has been contaminated with Particulate Matter (PM) which is very much injurious to health. Besides this rapid increase of motor vehicle are also responsible to contaminate the air quality.