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 3.5 m/s (T = 25C, 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 = 298K. Does this concentration exceed the TLV-STEL