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Oxygen And Carbon Dioxide.
Explanation:
1. Fresh Oxygen: This Air Polution Is Safe And Made By Trees But Some Oxygen Has Virus Or Bacteria And Fresh Oxygen Helps People To Be Alive And Well.
2. Carbon Dioxide: This Type Of Air Is Highly Dangerous Made By Cars And Factorys If You Inhale It You Will Mostly Cough And This Type Of Air Has Different Types Of Bacteria.