4-26. The rate of emission of SO2 from the stack of a power plant is 126.1g/s. The effective height of the stack is 46m. Calculate the SO2 concentration in parts per million at a parking lot located 900m downwind from the stack on a sunny October day when the wind velocity is 4m/s. Use class C stability and rural conditions. 4-27. How may meters downwind from the stack does the maximum ground-level concentration of SO2 occur for Problem 4-26? What is the value of the concentration in parts per million at that location? 4-26. The rate of emission of SO2 from the stack of a power plant is 126.1g/s. The effective height of the stack is 46m. Calculate the SO2 concentration in parts per million at a parking lot located 900m downwind from the stack on a sunny October day when the wind velocity is 4m/s. Use class C stability and rural conditions. 4-27. How may meters downwind from the stack does the maximum ground-level concentration of SO2 occur for Problem 4-26? What is the value of the concentration in parts per million at that location