Given: Q=50g/s,H=50m,u=5.5m/s, class D stability in a rural area. The ground-level concentration along the centerline at a downwind distance of 500m from a stack (i.e., x=500,y=0,z=0 ) is g/m3. The general dispersion model is (Use Figure 4-6 and Figure 4-7 if needed;1 g=106g ): C(x,y,z)=2yzQexp(2y2y2)[exp[2z2(zH)2]+exp[2z2(z+H)2]]