Which of the following pollutants contributes to the formation of smog?

Smog is a severe type of air pollution that occurs when a combination of air pollutants, primarily from human activities, reacts with sunlight. The primary pollutants that contribute to the formation of smog are oxides of nitrogen (NOx) and volatile organic compounds (VOCs). These pollutants are released by various sources, including emissions from vehicles and incinerators.

NOx is released from the burning of fossil fuels, such as gasoline in vehicles, coal in power plants, and natural gas in home heating systems. VOCs are released from a variety of sources, including gasoline and diesel fuel, solvents, and industrial processes.

When NOx and VOCs react with sunlight, they form ground-level ozone, a key component of smog. Smog can cause a range of health problems, including respiratory issues, eye irritation, and aggravation of existing health conditions like asthma.

To address smog, it's important to reduce emissions of NOx and VOCs from sources like vehicles and industrial processes.

Water does not contribute to the formation of smog.