Carbon Dioxide (CO₂)

CAS Number: 124-38-9
Carbon dioxide (CO₂) is a colorless, odorless gas produced by combustion, fermentation, metabolic processes, and industrial operations. It is widely present in breweries, beverage carbonation facilities, confined spaces, greenhouses, HVAC systems, and fire suppression environments. While CO₂ is not toxic in the traditional sense, it acts as a simple asphyxiant and metabolic stimulant. At elevated concentrations it causes headache, dizziness, shortness of breath, and loss of consciousness, and is potentially fatal in confined spaces. CO₂ monitoring is critical for ensuring adequate ventilation and preventing asphyxiation hazards, especially in low-lying areas where the gas can accumulate.

Carbon dioxide (CO₂) monitoring is important anywhere the gas can build up and reduce oxygen levels, especially in confined spaces and areas using dry ice. Rent CO₂-capable gas monitors from RAECO Rents for confined space entry, beverage production, cold storage, and indoor agriculture applications. Gas monitors are bump tested or span calibrated on the day of shipment, and our team provides practical guidance selecting the right monitor and alarm settings, with fast turnaround and phone support so you can get reliable field readings quickly.

Regulatory Exposure Limits

As of March 17, 2026

OSHA PEL
TWA: 5000 ppm (9000 mg/m³)
STEL: N/A
C: N/A
NIOSH REL
TWA: 5000 ppm (9000 mg/m³)
STEL: 30,000 ppm (54,000 mg/m³)
C: N/A
ACGIH TLV
TWA: N/A
STEL: N/A
C: N/A
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