Which air pollutant is produced mostly through vehicle emissions?

Vehicle emissions are a significant source of several pollutants, but carbon monoxide is particularly prominent among them. It is produced primarily from the incomplete combustion of fossil fuels in automobiles. When gasoline or diesel engines burn fuel, not all of the carbon in the fuel is converted to carbon dioxide; some is released as carbon monoxide, a colorless, odorless gas that can be harmful to human health and the environment.

Carbon monoxide poses a risk in urban areas where vehicle traffic is dense, leading to elevated levels in the atmosphere. This pollutant can interfere with the blood's ability to carry oxygen and can have serious health effects, especially in enclosed or poorly ventilated spaces.

While particulate matter, volatile organic compounds, and sulfur dioxide are also pollutants associated with automotive emissions, they arise from different processes or sources. Particulate matter includes tiny particles that can stem from various sources, including industrial processes and natural phenomena, as well as vehicle emissions, but it is not exclusively derived from vehicles. Volatile organic compounds (VOCs) are emitted from a wider range of products and sources, including solvents and industrial processes, and while they can come from vehicles, they are not produced mostly through this source. Sulfur dioxide is primarily produced from fossil fuel combustion in power plants