a. Discuss in detail the differences between the following gaseous and particulate air emission control processes and in each case, give two examples of typical industries producing a relevant air pollutant and how you would best apply the control process. (i) Combustion (10 marks) (ii) Selective catalytic oxidizer (10 marks) (iii) Adsorption (10 marks) (iv) Absorption (10 marks) (v) Gravity settling chambers (10 marks) Hint: Use the general approach illustrated under evaluation and selection of air pollution control