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

The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is
  1. 9
  2. 250
  3. 49
  4. 850

Solution

The acceptable level of carbon monoxide gas (CO) in the atmosphere is $\approx 9 \mathrm{ppm}$.

Asked in: AP EAMCET 2010

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