In this book, the health impacts of promoting walking to school as part of a comprehensive health impact assessment (HIA) were examined. The chapter focused on a single area of analysis - physical activity and associated changes in body mass index (BMI). The second chapter of this book reviews the potential health outcomes related to redeveloping a dangerous highway; the third chapter examined noise health impact assessment, with a focus on noise levels, peak levels and reverberation times of playrooms. The authors discuss the practical measures that can be taken for effective noise prevention that could help improve actual noise conditions and minimize the risk of health effects. The last chapter reviews the persistence of microbial adhesion and its challenges to the establishment and maintenance of hygienic conditions in various environments.