"The National Atmospheric Release Advisory Center (NARAC), located at Livermore, is the premier capability in the U.S. for real-time assessments of the dispersion and potential impact of hazardous materials released into the atmosphere. NARAC provides the technical, scientific, and operational capabilities for the DHS-led Interagency Modeling and Atmospheric Assessment Center (IMAAC), which serves as the coordinating center and single source of federal plume-modeling predictions in the event of a nationally significant incident". (LLNL, Global Treats and Security, 2006, p. 21)