Ozone is formed through the reaction of which elements under sunlight?

Ozone is formed when oxygen molecules react in the presence of sunlight, along with other elements such as nitrogen oxides and hydrocarbons. This process occurs in the atmosphere and is part of the photochemical reactions that lead to the formation of ground-level ozone, a key component of smog. Sunlight provides the energy required to break down nitrogen oxides and hydrocarbons, allowing for the synthesis of ozone from the oxygen in the atmosphere.

The other combinations listed do not accurately represent the process of ozone formation. For instance, carbon monoxide and sulfur dioxide do not contribute to the formation of ozone; instead, they are pollutants that can contribute to various forms of air quality degradation. Water and nitrogen do not directly participate in the production of ozone in the same manner, nor does the combination of hydrocarbons and methane accurately describe the photochemical processes involved in ozone creation. Understanding this process is essential for grasping the complexities of atmospheric chemistry and air pollution control.