The basic component of smog is: (a) PAN (b) PBN \( P \) (c) \( \mathrm{NO}_{2} \) (d) All of these W

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The basic component of smog is:
(a) PAN
(b) PBN
\( P \)
(c) \( \mathrm{NO}_{2} \)
(d) All of these
W
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