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Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 5 (Q.No. 46)
UPSC Civil Service Exam Questions
46.
What are the values of tolerable CO concentration in residential area, for continuous exposure durations of 1 hour and 8 hours, respectively ?
4 and 2 mg / m3
1 and 2 mg / m3
4 and 6 mg / m3
5 and 1 mg / m3
Answer: Option
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