Environmental aspects 21 Measurement Analysis 5 Pollution 4 Greenhouse gas mitigation 3 Greenhouse gases 3 Water 3 Air 2 Health aspects 2 Marine algae 2 Marine pollution 2 Noise 2 Purification 2 Sewage 2 Sewage disposal plants 2 Water quality 2 Activated sludge process 1 Air quality 1 Aquatic plants 1 Automobiles 1 Benthic ecology 1 Biochemical oxygen demand 1 Biological assay 1 Biomass 1 Botanical pesticides 1 Business enterprises 1 Carbon 1 Carbon cycle (Biogeochemistry) 1 Combustion 1 Combustion gases 1