Why does the air smell of ‘earth’ af­ter it rains

NZ Lifestyle Block - - Notebook -

The earthy smell af­ter it rains is linked to Acti­nobac­te­ria in soil, in par­tic­u­lar a mol­e­cule known as geosmin which is re­leased by cer­tain bac­terium when they die. The hu­man nose is ex­tremely sen­si­tive to geosmin and is able to de­tect it at very low con­cen­tra­tions. Geosmin is also re­spon­si­ble for the earthy taste of beet­roots.

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