O Level Biology Trivia App Download | Pollution: Smog as Cause Trivia e-Book PDF | 1193
O Level Biology MCQs (O Level) From Textbook

O Level Biology MCQs – Certification Test 1193

Pollution: Smog as Cause Trivia (Question 1193) – App & e-Book Download

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MCQ 1193: Major gaseous man-caused pollutant is:

  1. carbon dioxide
  2. carbon monoxide
  3. sulphur dioxide
  4. nitrogen oxides

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