A sample of air analysed at $0^{\circ} \mathrm{C}$ and 1 atm pressure is reported to contain $0.02 \mathrm{ppm}$ (parts per million) of $\mathrm{NO}_{2}$. Assume the gram molecular mass of $\mathrm{NO}_{2}$ as 46 and its volume at $0^{\circ} \mathrm{C}$ and 1 atm pressure as 22.4 litres per mole. The equivalent $\mathrm{NO}_{2}$ concentration (in microgram per cubic meter, round off to 2 decimal places) would be

A sample of air analysed at $0^{\circ} \mathrm{C}$ and 1 atm pressure is reported to contain $0.02 \mathrm{ppm}$ (parts per million) of $\mathrm{NO}_{2}$. Assume the gram molecular mass of $\mathrm{NO}_{2}$ as 46 and its volume at $0^{\circ} \mathrm{C}$ and 1 atm pressure as 22.4 litres per mole. The equivalent $\mathrm{NO}_{2}$ concentration (in microgram per cubic meter, round off to 2 decimal places) would be

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