Example $2$ :

An industrial site emitting $H_{2}S$ which has a pungent smell like rutton eggs, at a rate of $10\frac{g}{m}in?$ at ground level. Suppose that between $9$:$00-10$:$00$ hours in the morning there is a wind from the north at obout $4\frac{m}{s}.$ A slight sensible heot flux hos been meosured. There is a temperature inversion at $700$ m and the surface roughness of the area is $40$ cm $.$ What would the average conc in bir be during this hour at the boundory fence $200$ metres to the south? Would the oder be detectable? Whot difference would it make if the release was from a $30$ m stack, ossummg negligjble heat and mamentum for the release? Note that the smell of $H_{2}S$ is detectable at Obout $7k\frac{g}{m^3}.$