$20\mathrm{.}8$ For the data of Problem $20\mathrm{.}1,$ use Figure $20\mathrm{.}9$ to estimate the maximum downwind ground$-$level concentration and the distance at which it occurs.

$20\mathrm{.}1$ For an emission rate of $200$ g$/$s$,$ an effective stack height of $80$ m$,$ Class C stability, and a wind speed at stack height of $8$ m$/$s$,$ calculate the ground$-$level concentration of a nonreactive pollutant:

Please do $20\mathrm{.}8$ Figure $20\mathrm{.}9$

Maximum $($Cu$/$Q$)$ and distance to $\backslash ($ C$\_\{\backslash$text $\{$max $\}\}\backslash )$ as a function of stability $($solid lines$)$ and effective stack height $($numbers $[$in meters$]).($Adapted from Turner, $1970.)$