A factory uses 1.5 ML of fuel oil per month. The exhaust gases from the factory contain the following quantities of pollutants per ML per year.

(i)Particulate matter = 4 t/year

(ii) $SO_{2}$ : 20 t/year

(iii) NOx: 5 t/year

(iv) HC, CO and other : 3 t/year

Determine the safe height of the chimney required for the safe dispersion of the pollutants.

The concentrations of $\mathrm{NO} x, \mathrm{HC}, \mathrm{CO}$ and others are generally very much less than the concentration of $\mathrm{SO}_{2}$ in various industries. Hence the Board has made only $\mathrm{SO}_{2}$ as the criterion for design, along with the particulate matter. (a) Height of chimney on the basis of particulate matter. $$ …