In the absence of air pollution control devices, which of the following is the most significant source of sulfur dioxide?

Name: In the absence of air pollution control devices, which of the following is the most significant source of sulfur dioxide?
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Question

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Coal-burning power plants are the most significant source of sulfur dioxide emissions in the absence of air pollution control devices. Sulfur dioxide is a byproduct of burning coal, and power plants are known to emit large quantities of it into the air.

In the Absence of Air Pollution Control Devices, Which of the Following