Calculate the concentration and then decide whether adverse health effects will result. A release of PM2.5 at a mass flowrate of 490 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 2.55 km from the stack? W = Answer m ii) What is the average concentration at a point that is 2.55 km from the stack? [Use the formula for worst case concentration (MacBerthouex and Brown, 2013).] C = Answer mg/m3 = Answer m/m3 iii) A concentration of 35.5 to 55.4 g/m3 is unhealthy for sensitive groups. The people who are exposed will experience adverse health effects at the concentration that you calculated above. (True or False) Answer