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According to EPA of USA, the following is not one of the six major pollutants?

According to EPA of USA, the following is not one of the six major pollutants?

Q. According to EPA of USA, the following is not one of the six major pollutants?

  1. Ozone
  2. Carbon monoxide
  3. Nitrogen oxides
  4. Carbon di-oxide

Answer: Carbon di-oxide

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