The air pollutant unknown in nature is

The air pollutant unknown in nature is

  • A.
    NO
  • B.
    CO
  • C.
    HCHO
  • D.
    DDT
Correct Answer: Option C
Explanation

Formaldehyde (HCHO) is the most important carcinogen in outdoor air among the 187 hazardous air pollutants (HAPs) identified by the U.S. Environmental Protection Agency (EPA)

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