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Photochemical smog pollution does not contain:
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carbon dioxide
The major undesirable components of photochemical smog are nitrogen dioxide $\left(\mathrm{NO}_2\right)$, ozone $\left(\mathrm{O}_3\right)$, PAN (peroxyacetylnitrate), and chemical compounds that contain the $-\mathrm{CHO}$ group (aldehydes).
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