In order to determine the effectiveness of actions to improve environmental quality, it is necessary to be able to measure relevant environmental parameters at a level of detail accurate enough to distinguish the anticipated changes. Because the establishment and maintenance of monitoring systems is time consuming and expensive, the scale of such systems needs to be kept to a realistic minimum, and the greatest possible use must be made of the data collected. Experience with monitoring systems in World Bank projects has been mixed, but a number of key factors can be identified, including clear objectives, quality control, and sustainability.
By The World Bank Group, in collaboration with United Nations Environment Programme, United Nations Industrial Development Organization.
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