Research Article
Study on Numerical Simulation of Fire Danger Area Division in Mine Roadway
Table 4
The CO2 concentration thresholds.
| | Levels of danger | CO2 (%) |
| | Safe area (I) | <0.5 | | Slightly dangerous area (II) | 0.5∼3 | | Moderately dangerous area (III) | 3∼6 | | Highly dangerous area (IV) | >6 |
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