Question 176Steam Plants - 1st Asst/Chief

The correct answer is B) Sulfur. Sulfur is considered a significant and major source of air pollution in fuel oil. This is because when fuel oil containing sulfur is burned, it releases sulfur oxides (SOx) into the atmosphere, which are major contributors to air pollution and acid rain. Regulations have been put in place to limit the sulfur content in marine fuels to reduce these harmful emissions. The other options are incorrect because hydrogen, vanadium, and nitrogen are not the primary combustible elements in fuel oil that contribute to air pollution in the same way as sulfur.