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Low Level Ozone or Photochemical Smog is formed when sunlight reacts with clouds of hydrocarbons and nitrogen dioxide polluted air (car exhaust and industrial emissions).

Ozone is three oxygen atoms combined into one molecule. Low level ozone is formed when sunlight excites the nitrogen dioxide molecules (NO2) and they lose one oxygen atom and form Nitric Oxide (NO). The free oxygen atom is absorbed by an oxygen molecule (O2) to form an Ozone molecule (O3).

The Nitric Oxide and Ozone further react with the hydrocarbons. Hydrocarbon molecules are made up of Hydrogen (H) and Carbon (C) atoms, and the NO and O3 combine with them to make smog.

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