Tolerable limit of nitrogen oxides in air is _____________ ppm?
Correct answer: C. 5
- A. 0.1
- B. 1
- C. 5
- D. 25
Explanation
A commonly cited tolerable occupational concentration for nitrogen oxides is about 5 ppm. The lower values are more restrictive limits for particular exposure standards, while 25 ppm is too high for safe routine exposure.
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