text: themselves with financial aid and technical assistance is being promoted and efforts to strengthen the Soil and Territorial Reserves System are being made. 139. In regard to ecology, means of persuasion and concertation are being strengthened for the control of domestic, industrial and vehicular pollution in the worst affected hydrological basins; districts for water pollution control are being rehabilitated in cooperation with the municipalities and States. Air monitoring networks are in operation in urban areas given a priority rating in respect of levels of atmospheric pollution. 140. As for the policies of regional and urban development, the basic goal is still decentralization of the nation's life and a better co-ordination of activities undertaken by the States and departments of the Federal Government. In line with the principles governing the national urban development programme, the balanced growth of selected medium-sized cities is being encouraged and the development of rural development centres is being promoted through the establishment of services to support agricultural and agro-industrial production. 141. The Government of the Federal District is carrying out its activities through programmes of urban reorganization and environmental protection so as to include these tasks in the overall economic and social strategy of the metropolitan zone of Mexico City. Particular attention is being paid to efforts designed to expand and improve the provision of basic services, particularly those concerned with the water system, public transport and public safety.E/1986/3/Add.l3 page 29 142. The rural develo£wnent policy seeks to improve the levels of prosperity of the rural population on the basis of increasing production and productivity in agriculture, encouraging producers to organize themselves and using resources more efficiently. The main activities in this respect are aimed at supporting the basic crops, essential in the non-irrigated areas, with a view to strengthening self-sufficiency in maize, beans, wheat and 
analysis: This text appears to be discussing the government's policies and initiatives in various areas, including environmental protection, urban development, and rural development. While economic development is a significant aspect of these policies, it is not the primary focus. The text also touches on natural resources and environmental issues, such as pollution control and air monitoring networks.