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Which of the following reaction or process does not contribute to air pollution in the troposphere ?
(a) \( \mathrm{N}_{2}(g)+\mathrm{O}_{2}(g) \stackrel{\text { Lightning }}{\longrightarrow} 2 \mathrm{NO}(g) \)
\( P \)
\( 2 \mathrm{NO}(g)+\mathrm{O}_{2}(g) \stackrel{\text { R.T. }}{\longrightarrow} 2 \mathrm{NO}_{2}(g) \)
W.
(b) \( \mathrm{Cl}^{*}(g)+\mathrm{O}_{3}(g) \longrightarrow \mathrm{ClO}^{*}(g)+\mathrm{O}_{2}(g) \)
(c) Burning of fossil fuels
(d) Anaerobic decomposition of organic matter
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