Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Impact of Pollutants on Human Health

निम्नलिखित में से किसे एक प्रमुख इनडोर वायु प्रदूषक माना जाता है?

1
पारा
2
रेडॉन
3
हीलियम
4
आर्गन
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