Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
Correct answer: D. 5000
- A. 50
- B. 1000
- C. 2000
- D. 5000
Explanation
The commonly used maximum allowable workplace concentration for carbon dioxide is 5000 ppm, or 0.5% by volume, for an eight-hour exposure. Concentrations near 1000 ppm are mainly used as an indoor-air-quality guideline rather than the occupational limit.
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