Which statement is true about sulfur dioxide emission sources?

• A. Low-sulfur Coal and Natural Gas.
• B. High-sulfur Coal and Oil.
• C. Biomass and Biofuels.
• D. Solar and Wind.

Answer: (B)

Sulfur dioxide comes from burning fuels that contain sulfur. When fuels with higher sulfur content are burned, sulfur is released and oxidized to SO2, unless controls remove it. High-sulfur coal and oil contain enough sulfur that they produce noticeable SO2 emissions in power plants and other combustion sources. In contrast, low-sulfur coal and natural gas have much less sulfur, so their SO2 emissions are much smaller. Biomass and biofuels typically have lower sulfur content, so they are not major SO2 sources compared with high-sulfur fossil fuels. Solar and wind don’t involve combustion and thus emit virtually no sulfur dioxide during operation. So the statement that high-sulfur coal and oil are sources of sulfur dioxide is the true one.