Nayab GulSupervisor By: Professor Dr. Sardar Khan2026-09-212026-09-212012http://repository.uop.edu.pk/123456789/589I pay countless thanks to Almighty Allah, Creator for all of us. Who guides in darkness, help in difficulties, and as a result I have finally accomplished my work. All respect for the Holy prophet (Peace Be Upon Him), who enabled us to recognize our Creator. I would like to express the happiness, deep gratitude and thankfulness to my research supervisor Associate Professor Dr. Sardar Khan, Department of Environmental Sciences, University of Peshawar, for his keen interest, co-operation, guidance, valuable suggestions and encouragement.enThesis