According to the National Ambient Air Quality Standards (Central Pollution Control Board, Govt. of India, notification 2009) which of the following statement(s) is/are correct?
- $\mathrm{SO}_{2}$ and $\mathrm{NO}_{2}$ have annual average standards; while $\mathrm{O}_{3}$ and $\mathrm{CO}$ have eight hour average standards.
- $\mathrm{SO}_{2}$ and $\mathrm{CO}$ have annual average standards; while $\mathrm{O}_{3}$ and $\mathrm{NO}_{2}$ have eight hour average standards.
- $\mathrm{SO}_{2}$ and $\mathrm{CO}$ have eight hour average standards; while $\mathrm{O}_{3}$ and $\mathrm{NO}_{2}$ have hourly average standards.
- $\mathrm{SO}_{2}$ and $\mathrm{NO}_{2}$ have 24 hour average standards; while $\mathrm{O}_{3}$ and $\mathrm{CO}$ have hourly average standards.
