1. R.P.Samarakkody, H.D.S.Premasiri “Trends of air pollution in Colombo”, Newsletter, Clean Air, AirMAC, Ministry of Forestry and Environment, 01,June 2001, 08 – 09.   2. Samarakkody, R.P., Premasiri, H.D.S., Kumari, B.M.S.S., Darmasena, N.P.,"Use of Passive Air Quality Monitoring Techniques for Regional Air Pollution Monitoring" submitted, International Conference on Relating the Environment to Regional development, to be held on 14th and 15th, September, 2002   3. Samarakkody, R.P., Premasiri, H.D.S., Annakkage, C.J.,"Is Particulate a Problem in Colombo" submitted to International Conference on Relating the Environment to Regional development, to be held on 14th and 15th, September, 2002.   4. Premasiri, H.D.S., Samarakkody, R.P., Annakkage, C.J., Basnayake, G.B.M.A., "Particulate Pollution and Ratio of SPM:PM10:PM2.5 in Colombo Atmosphere" Proc. Sri Lanka Assoc. Adv. Sci. 59, 2003, 221.   5. Samarakkody, R.P., Premasiri, H.D.S., and Kumari, B.M.S.S., "Change in Atmospheric Lead Levels in Colombo after Phasing out Leaded Gasoline in Sri Lanka" Proc. Sri Lanka Assoc. Adv. Sci. 59, 2003, 236.   6. R.P.Samarakkody, H.D.S.Premasiri “Trends of air pollution in Colombo”, Newsletter, Clean Air, AirMAC, Ministry of Forestry and Environment, 01,June 2001, 08 – 09.   7. Annakkage C.J. , Samarakkody R.P.S. Perera M.D.C, Premasiri H.D.S. " What will be the severity of the Problem of Air Pollution in Colombo City?, National symposium on Air Quality Management 2nd - 3rd December 2004. (25).   8. Premasiri H.D.S., Perera M.D.C., Annakkage C.J., Fernando A.R.T. "Eligibility of Passive Sampling Techniques for rural Air Quality Monitoring " National symposium on Air Quality Management 2nd - 3rd December 2004. (27).   9. Samarakkody R.P.S., Premasiri H.D.S , Annakkage C.J., Basnayaka G.B.M.A "Identification of Critical and sinking areas in Colombo by means of spatial Air Quality Monitoring" National symposium on Air Quality Management 2nd - 3rd December 2004. (26).   10. Perera M.D.C., Premasiri H.D.S , Fernando A.T.R., Basnayaka G.B.M.A "Trends of Air Pollution in the largest Industrial area in Sri Lanka" National symposium on Air Quality Management 2nd - 3rd December 2004. (20).   11. Perera, G.B.S., Emmanuel, R., Premasiri, H.D.S., “Exposure to Aerosol Pollution and Reported Respiratory Symptoms among City Dwellers” Second National Symposium on Air Quality Management 17th March 2006. (01).   12. Rajepakse, I., Jayasinghe, C., Premasiri, H.D.S., “Comparison Between Indoor and Outdoor Contaminant Levels of Intermediate Rise Office Buildings in Urban and Suburban Locations” Second National Symposium on Air Quality Management 17th March 2006. (08).   13. Jayasinghe, C., Rajepakse, I., Premasiri, H.D.S., “Comparison of IAQ of Air-conditioned and Free Running Space in Office Buildings” Second National Symposium on Air Quality Management 17th March 2006. (09).   14. Premasiri, H.D.S., Jayasinghe, C., Rajepakse, I., “Effect of Indoor Air Quality in Office Building on Occupant Illnesses Symptoms (Sick Building Syndrome)” Second National Symposium on Air Quality Management 17th March 2006. (10)   15. Premasiri H.D.S., Fernando A.T.R., Perera M.D.C., Samarakkody R.P.S., Annakkage C.J., “Is Rainfall Intensity Playing a Major Role on Air Quality Levels in Colombo?” Second National Symposium on Air Quality Management 17th March 2006. (11).   16. Perera, G.B.S., Emmanuel, R., Nandasena, Y.L.S., Premasiri, H.D.S., “Exposure to Aerosol Pollution and Reported Respiratory Symptoms Among School children in Segments of Urban and Rural Settings in Sri Lanka” Tired National Symposium on Air Quality Management, 28th September 2007. (01).   17. Premasiri H.D.S., Fernando A.T.R., Perera M.D.C., Basnayake, G.B.M.A., Daniyel V.D., “Deterioration and Variation of Air Rescore in Colombo City” Forth National Symposium on Natural Resource Management, 29th-30th August 2009. (26).   18. Premasiri H.D.S., Samarakkody R.P.S., Basnayake, G.B.M.A., Fernando A.T.R., Daniyel V.D., “Potential Air Pollution Hazard Risk Areas in the City of Colombo” National Symposium on “Creating Disaster Free Safe Environment” 12th November 2009. (39).   19. Premasiri H.D.S., Samarasinghe I.H.K, Lakmini K.M.N., Jayasinghe D.A.D, “Population Exposure to the Air Pollutant in Kandy Municipal Council Area” Fifth National Symposium on Natural Resource Management, 11th May 2012. (09).   20. Premasiri H.D.S., Dias S.V., Premalal K.H.M.S, “Impact of Extreme Weather Condition on Colombo Air Quality Levels” Fifth National Symposium on Natural Resource Management, 11th May 2012. (11).   21. Premasiri H.D.S., Samarasinghe I.H.K, Lakmini K.M.N., “Population Exposure Risk Assessment to Air Pollution in Kandy City Area” National Symposium on “Sustainable Disaster Resilient Technologies” 13th December 2012. (19).