Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
Correct answer: C. 400
- A. 20
- B. 100
- C. 400
- D. 200
Explanation
SO₂ becomes rapidly life-threatening at very high concentrations, with about 400 ppm commonly cited as a potentially fatal level. Lower concentrations such as 20 ppm mainly cause severe respiratory irritation rather than immediate death.
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