railway RRB JE (CBT I + CBT II) Mock Test 2024 Current Affairs Environment Environment Policies Acts and Conventions

राष्ट्रीय स्वच्छ हवा कार्यक्रम केंद्र सरकारने कोणत्या वर्षात सुरू केला आहे?

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2018
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2017
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2020
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2019
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