Peroxyacetyl nitrate is not the only compound of this sort, as a number of species of the
Over the past fifty years, knowledge of the incredibly complex chemistry involved in
the formation of smog has increased significantly (see Tropospheric Ozone Pollution;
Gas-Phase (Photo-)Chemical Processes in the Troposphere). Besides the oxidants
formed from the chemical reactions described in sections above, three other sets of
reactions involve chain termination steps. The first of these is the reaction of hydroxyl
radical ( OH ) with nitrogen dioxide ( NO 2 ) to form nitric acid ( HONO2 )