Which of the following are classified as gaseous pollutants?

The classification of gaseous pollutants is based on their impact on air quality and human health. Carbon Monoxide and Sulfur Dioxide are both well-known for their detrimental effects when present in the atmosphere.

Carbon Monoxide is a colorless, odorless gas produced by the incomplete combustion of fossil fuels. It poses significant risks to human health, including the potential for poisoning due to its ability to bind with hemoglobin in the blood, thus reducing oxygen transport.

Sulfur Dioxide, on the other hand, is a gas that results from volcanic eruptions and industrial processes, particularly those associated with the burning of fossil fuels that contain sulfur. This gas can lead to respiratory problems and is also a precursor to the formation of acid rain, which can have severe environmental impacts.

Other options contain gases that may not be classified as pollutants or do not have significant harmful effects on human health compared to carbon monoxide and sulfur dioxide. While gases like ozone and ammonia can be harmful at certain levels, carbon monoxide and sulfur dioxide are more universally recognized as pollutants due to their prevalence and the severity of their effects on air quality and public health.