Peroxy Acetyl Nitrate $(PAN)$,a class of hazardous air pollutants,stems from:
$I.$ $O_{2}$
$II.$ $SO_{x}$
$III.$ $NO_{x}$
$IV.$ $HC$
$I.$ $O_{2}$
$II.$ $SO_{x}$
$III.$ $NO_{x}$
$IV.$ $HC$
- A$I$ and $III$
- B$II$ and $III$
- C$II$ and $IV$
- D$III$ and $IV$
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