The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is

Question

The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is (A) 9 (B) 250 (C) 49 (D) 850

Tardigrade Admin · Accepted Answer

The acceptable level of carbon monoxide gas (CO) in the atmosphere is ≈ 9 ppm.

Q. The acceptable level of carbon monoxide gas $(CO)$ in the atmosphere in ppm level is