What are the two forms of oxygen found in the atmosphere ? What is their importance ? Share with your friends Share 0 Ujjwal answered this Oxygen gas-we breathe in oxygen.Ozone-it protects us from UV rays of the sun. 0 View Full Answer Purva Daga answered this Molecular oxygen and Ozone.The two allotropes of oxygen that occur in our atmosphere are molecular oxygen and ozone -3 Ayushi Sharma answered this The two forms of oxygen found in the atmosphere are: (i) Diatomic molecular form with chemical formula O2. (ii) Triatomic molecular form with chemical formula O3 known as ozone. 11