A point source Gaussian plume model for a power plant uses 50 m as the effective stack height (see Figure below). The night is overcast. (Note:

A point source Gaussian plume model for a power plant uses 50 m as the effective stack height (see Figure below). The night is overcast. (Note: This is not the same as cloudy in this model) Your concern is with ground-level pollution at two locations, A and B, which are 1.2 and 1.4 km directly downwind from the stack.