Chemical Reactions Involved in the Formation of Smog

1
Chemical Reactions Involved in the Formation of
Smog

1. Photochemical Smog
2. Industrial Smog

2
Photochemical Smog (brown air)
1) NO VOC ? NO2 (nitrogen dioxide)
2) NO2 UV ? NO O (nitric oxide molecular O)
3) O O2 ? O3 (ozone)
4) NO2 VOC ? PAN (peroxyacetyl nitrate)
NET RESULTS
NO VOC O2 UV ? O3 PAN other particulates
3
Industrial Smog
1) C O2 ? CO2 (carbon dioxide)
2) S O2 ? SO2 (sulfur dioxide)
3) SO2 O2 ? SO3 O (sulfur trioxide)
4) SO3 H2O ? H2SO4 (sulfuric acid)
5) H2SO4 NH3 ? (NH4)2SO4 (solid ammonium sulfate)
4
Compare Contrast
Photochemical Industrial
involves N UV rays needed Main Product O3 involves S No UV needed Main Product (NH4)2SO4