Photochemical smog

Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases to form harmful

Irritates the eyes a

Peroxyacetylnitrate. Nitrogen dioxide, oxygen and hydrocarbons react with the sunlight.

Catalytic Converters.Is a strategy that tries to reduce the emission of carbon monoxide and nitrogen oxide production. It uses platinum or radium  (reduce the amount) The unburned hydrocarbons are catalyzed to produce carbon dioxide and water vapor. 

The catalytic convertors needs to promote the necessary rate of acting over the combustion, reducing first the nitric oxide to nitrogen gas to avoid the oxidation of the carbon dioxide

The ozone Is form outside the combustion chamber when the nitrogen oxide (NO2) is divided between nitrogen and oxygen. Then the oxygen reacts with other particles of oxygen in the air to form ozone.