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Air Monitoring Applications - Petrochemical
Carbon Monoxide
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 Carbon monoxide emissions are of concern in petroleum refining because they may occur as a result of the combustion of fossil fuels in the catalyst regeneration process. Although scrubbers are employed to prevent caustic emissions, carbon monoxide may still be released. Exposure to carbon monoxide results in headaches, nausea, dizziness, confusion and other symptoms; it affects the central venous system, lungs, and central nervous system.
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| Exposure Limits |
Contaminant/
Agency |
Exposure Limit |
| Carbon Monoxide |
| OSHA (PEL) |
for General Industry: 50 ppm (55 mg/m³) TWA
for Construction Industry: 50 ppm (55 mg/m³) TWA
for Maritime: 50 ppm (55 mg/m³) TWA |
| ACGIH (TLV) |
25 ppm (29 mg/m³) TWA |
| NIOSH (REL) |
35 ppm (40 mg/m³) TWA; 200 ppm, 229 mg/m³ Ceiling |
| NIOSH (IDHL) |
1200 ppm |
| (TWA=Time-weighted average; TLV=Threshold Limit Value; PEL=Personal Exposure Limit, REL=Recommended Exposure Limit; IDHL=Immediately Dangerous to Life and Health concentration) |
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