Which of the following gases is not a source of air pollution?

مندرجہ ذیل میں سے کون سی گیس فضائی آلودگی کا ذریعہ نہیں ہے؟

N₂

NO₂

SO₂

None of these

Nitrogen (N₂) makes up 78% of Earth's atmosphere and is not a pollutant.

NO₂ and SO₂ are major air pollutants from vehicles and industries.