Ube is an industrial city of 175,000 and a century old coal mine which closed in 1967. Since the 1940s coal, cement and chemical factories have been a significant source of pollution in the area. Ube City established a committee, comprising university professors, industrial leaders, citizens and city officials, to clean the polluted air. The Committee decided to have industry install dust control equipment and to have the City and citizens purchase water sprays for road cleaning, and to promote the planting of greenery and flowers as part of a post second world war recovery plan. Ube City is considered a leader in the scientific approach to air pollution control using epidemiology, pollution monitoring, engineering, operation, management and investment by industry and information and education by mass media. The area's comprehensive pollution control plan started in 1976 with a series of mid-term plans which included the installation of a sewerage system, a night soil treatment plant and urban incineration plants. A recycling centre with classes for consumers recently begun operation and automatic, mobile and manual monitoring systems for air, water and noise were installed to verify compliance with quality standards. About 50 volunteers monitor odours from surrounding chemical plants. The airport plan was adjusted based on the advice of the City Environment Council, and in 1971 a joint emergency task force was established by the City's fire department and industry to cope with plant accidents and oil spills.