Srimad-Bhagavatam: Canto 2 - Chapter 1 - Verse 2
Sanskrit:
सर्वासूनां च वायोश्च तन्नासे परमायणे ।अश्विनोरोषधीनां च घ्राणो मोदप्रमोदयो: ॥ २ ॥
ITRANS:
sarvāsūnāṁ ca vāyoś catan-nāse paramāyaṇeaśvinor oṣadhīnāṁ caghrāṇo moda-pramodayoḥ
Translation:
His two nostrils are the generating centers of our breathing and of all other airs, His smelling powers generate the Aśvinī-kumāra demigods and all kinds of medicinal herbs, and His breathing energies produce different kinds of fragrance.