Environmental conditions. Environmental quality. Environmental indicators. Environmental degradation 21 Malaysia 12 Environmental pollution 8 Enviromental management 6 Air pollution and its control 5 Qualities of water. Water quality 4 TJ Mechanical engineering and machinery 4 Water pollution 4 NA Architecture 3 Organizational effectiveness. Performance measurement 3 Special types of environment. Including soil pollution, air pollution, noise pollution 3 TD Environmental technology. Sanitary engineering 3 Algorithms 2 Architecture in relation to special subjects 2 Attribution of news. Reporters and reporting 2 Business ethics 2 Environmental aspects of forestry 2 Environmental auditing 2 Environmental effects of industries and plants 2 Environmental engineering 2 Environmental policy and economic development. Sustainable development. Environmental management 2 Environmental protection 2 Environmental reporting 2 Environmentalism. Green movement 2 Indoor air pollution. Including indoor air quality 2 Municipal refuse. Solid wastes 2 Travel and the state. Tourism 2 ASEAN 1 Academies and learned societies (General) 1 Aesthetics of cities. City planning and beautifying 1