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  9. Q86

UPPSC PCS 2019 · Question 86 of 150

Smog is essentially caused by the atmospheric presence of

Environment

  1. AOxygen and ozone
  2. BOzone and nitrogen
  3. COxygen and nitrogen
  4. DOxide of nitrogen and sulphurCorrect

Answer: D. Oxide of nitrogen and sulphur

Explanation

Smog is caused by oxides of nitrogen and sulphur in the atmosphere.

Source: https://theexampillar.com/uppsc-pcs-acf-and-rfo-pre-exam-paper-2019-paper-1-in-english-answer-key/

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