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This book, along with its companion volume, discusses the research needs, institutional modifications, and legislative changes that must be addressed to deal more effectively with the risks of hazardous materials. Prominent among the research needs is the necessity to assess the health effects of low-level exposure to toxicants. For none of these agents (lead, mercury, radiation, PCDDs, dioxins, PCBs, pesticides) is the existing toxicological data sufficient to define unambiguously the dose-effect relationship in the low-dose domain. Another uncertainty is our ignorance of how individuals...

This is a response to the need for up-to-date information about three major challenges posed by urbanization: buildings, transportation, and land use. Planning the built environment involves integrating all aspects of human life so that an esthetic, economic, and sustainable system is established. There are challenges which arise from this, but the primary goal is to provide adequate, safe, efficient, and affordable housing for the populations. The goal is to convert chaos to order, to make cities workable, to bar bad development, to encourage the building of necessary facilities, and to...