Ganga action plan INSTRUMENTAL METHODS OF CHEMICAL ANALYSIS Ethnobiology Noise pollution PHYSICAL CHEMISTRY EXPERIMENTS Radio activity and pollution AIR POLLUTION Air quality management Coagulation Disinfection Earth Summit Earth summit Ecology Green house effect INDUSTRIAL POLLUTION Indian river water quality Indoor air pollution Instrumental method of analysis Metals Toxicity Noise control Noise pollution--Environmental aspects Ozone chemistry POLLUTION Photochemical smog Plastic and pollution Plastics and pollution RIO DE JANEIRO Earth Summit RIO DE Janeiro Smog, Photochemical System analysis