LEED certification may require testing for volatile organic compounds (VOCs), formaldehyde, particulate matter, carbon dioxide, and other indoor air pollutants depending on the specific credits being pursued. Testing must follow EPA-approved protocols and use accredited laboratory analysis to meet LEED documentation requirements. Professional testing evaluates ventilation effectiveness, indoor air quality performance, and building material emissions to demonstrate compliance with health-based standards. The scope of testing varies by LEED rating system (New Construction, Existing Buildings, etc.) and the specific credits targeted by the project team.