A paper plant is proposed for a location 1 km upwind from a town. It will emit 40 g/s of hydrogen sulfide, which has an odor threshold of about 0.1 mg/m 3. Winds at the effective stack are typically 4 m/s blowing toward the town. What stack height should be used to assure concentrations are no more than 0.1 times the odor threshold at the near edge of town (1 km away) on a class B day? The stack has a diameter of 5 m, the gas exit velocity is 13.5 m/s, and the gas exit temperature is 145 C. The ambient temperature and pressure are 15 C and 100 kPa, respectively. Will any buildings in the rest of the town (farther away than the near edge located 1 km downwind from the paper plant) experience higher concentrations than a residence at the boundary?