This is the correct option as pollution from CFCs is depleting the useful ozone layer of the upper atmosphere.

Sulphur dioxide and nitrogen oxide contribute in the formation of smog.

Nitrogen dioxide is acidic in nature.

Nitrogen (N₂) is not an air pollutant. 

Burning of fuels is the main cause of air pollution.

Acid rain makes water and soil acidic. It causes death of aquatic plants and animals. It corrodes sculptures, monuments and buildings.

Ozone hole is a region of marked thinning of the ozone layer at higher altitudes. It is a toxic gas and the ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation.  

CO₂ is a greenhouse gas because it traps some of the energy radiated by the earth and does not allow it to escape. 

Smog is formed in cold weather by the combination of smoke and fog.

The increase in the average temperature of earth’s atmosphere is termed as global warming.