What type of emissions are primarily associated with burning coal and fuel oil?

Burning coal and fuel oil is primarily associated with sulfur oxides emissions, which are formed when the sulfur content of these fuels is combusted. Coal and fuel oil can contain significant amounts of sulfur, which, when burned, reacts with oxygen to form sulfur dioxide (SO₂) and other sulfur compounds. These sulfur oxides can lead to acid rain, respiratory problems, and other environmental issues.

While carbon dioxide is also a major emission from burning fossil fuels, the distinctive characteristic of coal and fuel oil combustion is their contribution to sulfur oxides, making it a key concern regarding air quality and environmental regulations. Nitrogen oxides and particulate matter may also be emitted, but the signature emissions tied specifically to coal and fuel oil combustion emphasize sulfur oxides as a primary concern.