Calculate the concentration and then decide whether adverse health effects will result. A release of PM2+5 at a mass owrate of 150 mg/s occurs at a wind velocity of 1 m/s. If the plume height is 50 m: i) What is the plume width at a point 0.85 km from the stack? W: m ii) What is the average concentration at a point that is 0.85 km from the stack? [Use the formula for worst case concentration (MacBerthouex and Brown, 2013).] C= 0 mg/m3