What are the values of tolerable CO concentration in residential area, for continuous exposure durations of 1 hour and 8 hours, respectively ?

What are the values of tolerable CO concentration in residential area,

1.	What are the values of tolerable CO concentration in residential area, for continuous exposure durations of 1 hour and 8 hours, respectively ?
A.	4 and 2 mg / m3
B.	1 and 2 mg / m3
C.	4 and 6 mg / m3
D.	5 and 1 mg / m3
Answer» B. 1 and 2 mg / m3

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What are the values of tolerable CO concentration in residential area, for continuous exposure durations of 1 hour and 8 hours, respectively ?

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