Which of the following gaseous air pollutants is a major contributor to the formation of photochemical smog?
Nitrogen oxide
Carbon monoxide
Sulfur dioxide
Methane
Nitrogen oxide is a major contributor to the formation of photochemical smog, as it reacts with other pollutants and sunlight to create a mixture of harmful chemicals, such as ground-level ozone.Nitrogen oxides are a major contributor to the formation of photochemical smog, which is a type of air pollution that occurs in urban areas with high traffic and industrial activity.