What Is CO2 and Why Is It Dangerous in Industrial Settings?
Carbon dioxide (CO2) is a colorless, odorless, non-flammable gas formed by the combination of carbon and oxygen. At ambient concentrations (~400 ppm / 0.04%), it is harmless. However, in enclosed industrial spaces, CO2 can rapidly accumulate to levels that cause asphyxiation through both oxygen displacement and direct CO2 toxicity.
CO2 is approximately 1.5 times heavier than air, making it prone to pooling in pits, basements, cold storage floors, and fermentation tank bottoms. Because it has no odor, workers may not realize they are being exposed to dangerous concentrations until they are incapacitated.
CO2 Health Effects by Concentration
| CO2 Level | Health Effect | Exposure Time |
|---|---|---|
| ~1,000 ppm | Drowsiness, reduced concentration | Prolonged |
| 1,000–5,000 ppm | Headache, fatigue, increased breathing rate | Tens of minutes |
| 5,000 ppm (TWA limit) | Korean MoEL 8-hour occupational limit | 8 hours |
| 15,000 ppm (1.5%) | Severe headache, dyspnea, dizziness | Minutes |
| 30,000 ppm (3%) | Intense headache, nausea, visual disturbance | Minutes |
| 50,000 ppm (5%) | Risk of unconsciousness | Within 30 min |
| ≥100,000 ppm (10%) | Potentially fatal within minutes | Immediately |
※ Source: Korean Ministry of Employment and Labor Chemical Exposure Standards (2023), NIOSH Pocket Guide to Chemical Hazards
Real Accident Cases
Case 1 — Dry-Ice Cold Storage Asphyxiation (2022, Gyeonggi)
Two workers loading a dry-ice refrigerated container at a Gyeonggi logistics warehouse lost consciousness. Measured CO2 levels exceeded 7% inside the container. The workers had entered without prior gas measurement. (Source: Ministry of Employment and Labor Serious Accident Case Collection 2022)
WANDI EDW500 — IECEx-Certified Portable 5-Gas Detector
The WANDI EDW500 holds IECEx certificate TPS 25.0057X issued by TÜV SÜD, with the explosion-protection marking Ex da ia IIC T4 Ga—certified for safe use even in Zone 0, the most hazardous explosive atmosphere classification.
The EDW500 simultaneously measures up to five gases: CO2, O2, CO, H2S, and combustibles (EX). Its NDIR sensor for CO2 covers 0–5% (50,000 ppm) with real-time Bluetooth/LTE cloud data streaming and three-mode alarms (light, sound, vibration).
Prevention Scenario — How EDW500 Would Have Prevented the Accident
If the 2022 Gyeonggi workers had carried the EDW500, the device would have alarmed before container entry, immediately alerting both the worker and remote supervisors via cloud notification. Evacuation would have occurred before any incapacitation.
Common Industrial Environments Where CO2 Accumulates
- Cold/freezer storage (dry-ice sublimation)
- CO2 fire-suppression zones (server rooms, electrical rooms)
- Fermentation tanks — brewery and food processing
- Septic tanks and wastewater treatment facilities
- Welding and gas-cutting areas
- Underground tunnels and manholes (vehicle exhaust accumulation)
A Closer Look at the WANDI EDW500
Below are real photos of the WANDI EDW500 portable multi-gas detector.
