How do nitric oxide and sulfur dioxide react with air?

Nitric oxide (NO) results from the combination of O2 and N2 in lightning strikes. It is a radical and so is very reactive in the atmosphere. Its unpaired electron can be removed through oxidation to NO + or the molecule can be reduced to NO-. In biology, NO is important as a signaling agent.

Sulfur Dioxide reacts easily with other substances to form harmful compounds, such as sulfuric acid, sulfurous acid and sulfate particles ... The main source of sulfur dioxide in the air is industrial activity that processes materials that contain sulfur, eg the generation of electricity from coal, oil or gas that contains sulfur.