Civil Services HPPSC (Himachal Pradesh) HPAS Mock Test 2021 General Knowledge Ecology and Environment Environmental pollution

निम्नलिखित में से कौन द्वितीयक प्रदूषक नहीं  है?

1
PAN 
2
धूम कोहरा
3
सल्फर डाइऑक्साइड
4
ओजोन
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