Smog photochemistry in the troposphere Photochemical smog is an atmospheric condition that produces severe eye irritation and poor visibility, to name just two of the effects. Two of those components are produced through the burning of fossil fuels, most notably automobiles.
Ozone is a common oxidizing agent found in photochemical smog.
Its presence has historical significance in studies done in places like London, which used sulfur-containing coal as its main energy source. Atomic oxygen can also react with hydroxyl radicals, OH , and ozone to form the reactive hydrocarbon radicals utilized in the NOx system. The rate of this reaction depends on the temperature in the atmosphere. The rate of this reaction also depends on the temperature in the atmosphere. Radicals are fragments of molecules that have at least one unpaired electron, and are highly reactive.