Flue-gas desulfurization equipment is installed mainly to control emissions of:
Correct answer: D. Sulfur dioxide
- A. Ground-level ozone
- B. Carbon monoxide
- C. Particulate lead
- D. Sulfur dioxide
Explanation
Flue-gas desulfurization removes sulfur dioxide from combustion gases, commonly using alkaline sorbents. Carbon monoxide requires oxidation control, while ozone is formed in the atmosphere rather than emitted directly from most stacks.
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