Environmental Measurements Laboratory

The Environmental Measurements Laboratory (EML) is the former name of the current National Urban Security Technology Laboratory (NUSTL), a United States government-owned, government-operated laboratory. NUSTL is part of the Science and Technology (S&T) Directorate of the Department of Homeland Security (DHS). Effective December 1, 2009, EML was re-designated as NUSTL to reflect the Lab’s evolved mission and functions. NUSTL is the third name in the laboratory's history, following the Health and Safety Laboratory (HASL, 1953–1977) and the Environmental Measurements Laboratory (1977–2009).

The current Laboratory Director is Adam Hutter.

As a DHS federal laboratory, NUSTL tests and evaluates technologies and systems, including those developed by DHS, other agencies, and the private sector. From its Manhattan location it uses the New York metropolitan area as an urban test bed. Additionally, NUSTL assists New York area organizations and promotes the use of homeland security technologies and standards.

The NUSTL is located at the Federal Office Building at 201 Varick Street in SoHo, Manhattan, New York.