The concentration of Ozone corresponding to a mixing ratio of $120 \mathrm{ppbv}$ at pressure of $1$ atmosphere and temperature of $25^{\circ} \mathrm{C}$ is ________ $\mu \mathrm{g} / \mathrm{m}^{3}$ $\text{(rounded off to $1$ decimal place)}$.
Atomic weight of oxygen $=16 ; \mathrm{R}=8.314 \mathrm{~J} / \mathrm{K}-\mathrm{g}$. mole.
