Pollution in the atmosphere.
Sulfur Dioxide + Oxides of Nitrogen.

This site created by Stephanie, Jean and Clemson covers the following topics:

◦ Sources of Sulfur Dioxide.
◦ Sources of Nitrogen oxides.
◦ Reactions releasing sulfur dioxide into the atmosphere.
◦ Reactions releasing nitrogen oxides into the atmosphere.
◦ The evidence which indicates increases in atmospheric concentration of oxides of sulfur and nitrogen.
◦ Industrial origins of sulfur dioxide.
◦ Industrial origins of Oxides of Nitrogen.