Beyond what concentration of H2S in air, acute danger to human life exists ?
Correct answer: D. 700 ppm
- A. 50 ppm
- B. 100 ppm
- C. 300 ppm
- D. 700 ppm
Explanation
Hydrogen sulfide becomes rapidly life-threatening at several hundred ppm, and around 700 ppm can cause collapse, respiratory failure, and death within a short time. Lower concentrations such as 50 or 100 ppm cause severe irritation and toxicity but are not the usual value quoted for acute lethal danger.
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