the propylene vapors escaped at a rate of $30$ kg$/$s resulting in the plume$-$release of

flammable propylene vapor into the atmosphere. This occurred on a sunny afternoon with a

wind velocity of $3\mathrm{.}5$ m$/$s $($T $=25$C$,$ P $=1$ atm$).$ The plant is in a rural location, roughly $1000$ m

from a nearby town. Determine the worst$-$case scenario concentration in PPM of the propylene

vapor along the plume centerline downwind from the release, on the ground, at the town$$s edge.

P $=1$ atm, T $=298$K$.$ Does this concentration exceed the TLV$-$STEL