According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions?
✓ Correct answer: d) Power plants using fossil fuels
ExplanationEmissions that lead to high concentrations of SO2 gen- erally also lead to the formation of other SOx.The largest sources of SO2 emissions are from fossil fuel combustion at power plants and other industrial facilities.EPA’s national ambient air quali- ty standards for SO2 are designed to protect against exposure to the entire group of sulfur oxides (SOx).SO2 is the component of greatest concern and is used as the indicator for the larger group of gaseous sulfur oxides (SOx).Other gaseous SOx (such as SO3) are found in the atmosphere at concentrations much lower than SO2. 123
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