A system and method for estimating an amount of substance released into an
ambient thereby creating a plume includes at one sensor adapted to be
positioned at the plume and making multiple concentration measurements of
the released substance at multiple times. A computer-based analyzer system
is programmed with an algorithm. The analyzer receives concentration
measurements from the at least one sensor and the algorithm generates an
estimate of amount of substance released as a function of the multiple
concentration measurements and the time of the measurements.