Determine the down wind ground level concentration of SO$2$ from a $200$ m tall stack emitting$400$ g$/$s$.$ Determine the SO$2$ concentrations at a$)2000$ m down wind of the stack b$)2000$ m downwind and $100($y$)$ m cross wind. The following information is available to you: NeutralDEOnatmospheric conditions, stack exit velocity is $20$ m$/$s$,$ wind velocity at the stack height is $6$ m$/$s$,$ diameter of stack is $4$ m$,$ the heat output by the emission is $15$ MW$,$ the ambient pressure is $950$ mb$.$ Determine the plume rise using Briggs formula and use the effective stack height to calculate the downwind concentrations at a and b as above.