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An urban-oriented emergency assessment system, called CT-Analyst (trademark), was developed to evaluate airborne contaminant transport (CT) threats and aid rapid decisions for regions such as cities where other methods are slow and inaccurate. CT-Analyst gives both greater accuracy and much greater speed than alternate prediction tools because it embodies entirely new principles to function in the information-starved situations that characterize the first few minutes of a terrorist or accident scenario. CT-Analyst was designed for the military prior to 9/11 to use verbal and sensor reports, to use mobile sensors, and to function in realistic situations, such as the first few minutes of a harbor spill, where information about the airborne contaminant or chemical, biological, radiological (CBR) agent is highly uncertain. These improvements are made possible by pre-computing very accurate three-dimensional flow solutions that include solar heating, buoyancy, complete building geoetry, trees, and impressed wind fluctuations. Detailed 3D simulations for 18 wind directions are pre-computed for coverage regions where CT-Analyst is to be installed. CT-Analyst extends these results to all wind directions, speeds, sources, and source locations through a new data structure called Dispersion Nomografs. We generate these 'nomografs' for cities, ports, and industrial complexes well in advance so a manager in an emergency need not wait for supporting analyses. CT-Analyst also provides new real-time functions such as sensor data fusion, 'backtracking' reports and observations to an unknown source location, and even evacuation route planning. The resulting capability is faster, more accurate, more flexible, and easier to use than Gaussian and particle-based dispersion models.