Which standard helps ensure buildings are environmentally sound?

The correct answer is LEED, which stands for Leadership in Energy and Environmental Design. LEED is a widely recognized green building certification program developed by the U.S. Green Building Council (USGBC). It provides a framework for identifying and implementing practical and measurable green building design, construction, operations, and maintenance solutions.

LEED certification helps ensure that buildings are environmentally sound by promoting sustainable site development, water savings, energy efficiency, material selection, and indoor environmental quality. This standard encourages the use of sustainable practices throughout the building lifecycle, from design to construction and operation, aiming to reduce the overall impact on the environment and enhance the health and wellbeing of the occupants.

Other standards mentioned, while relevant in their own contexts, address different aspects. ISO refers to a variety of international standards covering quality management, environmental management, and other systems; NEPA is focused on environmental assessments for federal projects; and ASTM provides consensus standards for materials and products but doesn't specifically address environmental practices in building design.