Carbon Monoxide a colorless, odorless gass resulting from the incomplete combustion of hydrocarbon fuels. CO interferes with the blood’s ability to carry oxygen to the body’s tissues and results in adverse health effects.


Carbon Monoxide

Time-weighted average

10,000 (8.1) - 40,000 (32) µg/Nm3 (ppm)

Averaging time

8 hours - 1 hour

Time –weighted average Averaging Time Number of allowable exceedances
32 ppm 1-hour None
8.1 ppb 8-hour None
Number of allowable exceedances