This research developed an approximation formula for the prediction of downwind location from a stack that found the
maximum ground level concentration of air pollution based on Gaussian Model using Brigg The developed formula in research could be used in the prediction of the location which found the maximum
ground level concentration of the emitted air pollutant from the stack or xmax. This could be consequently used in the
prediction of the maximum ground level concentration which is very useful for the various environmental fields eg.
Environmental and Health Impact Assessment (EHIA). There are some limitations to apply such a technique with
the high stack effective height, especially for atmospheric stability classes of E and F, which required the further
development to correct such a problem.