डब्ल्यूएचओ के अनुसार, दुनि – McqOptions

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1.	डब्ल्यूएचओ के अनुसार, दुनिया की कितने प्रतिशत आबादी प्रदूषित हवा में रह रही है?
A.	90%
B.	80%
C.	70%
D.	60%
Answer» B. 80%

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