(a) Polluted air is to be treated through a fabric fitter (1 m in diameter and 10 m in length) at an air flow rate of 29450 cubic foot per min The area of the filtration is 500 square metres. Estimate the superficial velocity of the gas and the number of bags required for effecting this ration [1+2-3]

(b) Write few sentences on: (1) Source correction method and (ii) Tape sampler