environmental pollution environment protection 62 environment 58 contaminants 29 health harmful substances 24 ecology 23 wastes 19 more ... air pollution 18 water pollution 17 soil pollution 15 monitoring 14 ecotoxicology 12 imissions 12 environmental remediation 11 toxicity 11 radioactivity 9 recycling of wastes 9 biodegradation 8 transport 8 contamination 8 forests 8 carbon dioxide 8 toxic waste 8 issues 7 plants 7 mining engineering 7 biphenyls 6 chemical industry 6 decontamination 6 ecosystems 6 less ...