1. Department of Earth and Atmospheric Sciences, University of Nebraska Lincoln, P.O. Box 880340, Lincoln, Nebraska, USA
2. Industrial Technology Institute, Colombo, Sri Lanka
3. Department of Physics and Astronomy, The University of Alabama, Hunstville, AL 35806, USA
4. Department of Civil Engineering, Faculty of Engineering, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
5. Air Resource Management and Monitoring Unit, Central Environmental Authority, Battaramulla, Sri Lanka