railway RRB JE (CBT I + CBT II) Mock Test 2024 People Development & Environment Environmental Issues Pollution

सतही ओजोन किससे उत्पन्न होती है? 

1
परिवहन क्षेत्र
2
सीमेंट कारखाना 
3
वस्त्र उद्योग
4
रासायनिक उद्योग
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