Pollution Dissertations, Academic 62 Dissertations 60 Water 50 Environmental aspects 41 Air 33 Water quality 13 Measurement 11 Analysis 8 Groundwater 8 Water quality management 8 Heavy metals 7 Air quality management 5 Aquatic organisms 5 Haze 5 Rivers 5 Automobiles 4 Ecology 4 Effect of water pollution on 4 Environmental monitoring 4 Management 4 Research 4 Air quality 3 Carbon dioxide 3 Environmental management 3 Exhaust gas 3 Health aspects 3 Law and legislation 3 Motors 3 Purification 3