Abstract: A computer cloud implemented method and system for manually or electronically inputting real time geophysical location data, physical properties of the substance, associated release parameters of the physical substance into the open earth atmosphere, and weather data (historical, current or future forecasted data) on the assumption the release of the substance occurred at the same instantaneous time the weather data was entered and repeatedly calculating the results with new updated data for any of the above data parameters using algorithmic modeling of toxic substance releases to compute a model of the predicted toxic threat zone (Gaussian model) or a model of the predicted toxic plume pathway and associated exposure levels (CFD) and rendering the results electronically for visual display in, on or over any multi-coordinate display system in any medium and distributed or distributable to users electronically or manually when input parameters are updated, and displaying other related information associated wi