The secondary precursors of photochemical smog are

The secondary precursors of photochemical smog are
  1. $\mathrm{SO}_2$ and $\mathrm{NO}_2$
  2. $\mathrm{NO}_2$ and hydrocarbons
  3. $\mathrm{NO}_2$ and PAN
  4. $\mathrm{O}_3$ and PAN

Solution

The primary precursors of photochemical smog are $\mathrm{NO}_2$ and hydrocarbons. The secondary precursors are ozone and PAN (peroxyacyl nitrates).

Asked in: AP EAMCET 2021 (23 Aug Shift 2)

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