A terrorist releases 100 g of nerve gas as a single instantaneous emission at ground level at point x=y=z=0, at time t=0. The wind speed is 3 m/s and the stability class is C and the mixing height, L, is 2000 m. Estimate the maximum instantaneous value of the nerve gas concentration that would be observed at a point 5 km directly downwind of the emission point (x=5km, y=z=0).