Chemistry 5070 · O Level · Air quality and climate

Air quality and climate — practice question

The gases below may occur in air. 1 neon 2 carbon monoxide 3 nitrogen 4 methane Which of these gases are pollutants in the atmosphere?

  • A1 and 2
  • B1 and 3
  • C2 and 4
  • D3 and 4

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