How to clear the way for a soundly based health polica. Environmental conditions can greatly influence public health. On a local or regional level, environmental health surveillance continuously gathers and surveys health and ecological data, with teh aim to provide a sound basis for health policy and decision-makting. In this book, leading European specialists sort out how to create high-quality surveillance information. The discussed topics include spatial and geographic analysis, ristk assessment, spatial aggregation, data (in) compatibility, human biomonitoring approaches and the use of powerful geographic information technologies.