Moderate

Primary air pollution is____________________?

Correct answer: C. SO2

  • A. SO
  • B. SO3
  • C. SO2
  • D. None of the above

Explanation

Sulfur dioxide is a primary pollutant because it is emitted directly from sources such as coal combustion and industrial processes. Sulfur trioxide is generally formed secondarily from sulfur dioxide in the atmosphere.

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