Table 2.
Exposure levels of occupational hazardous factors in various workshops of the coking plant from 2011 to 2023.
| Detection factor | Occupational exposure limit (PC-TWA) | Coal preparation | Chemical production | Coking | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Test results | Detection points | Excessive points | Test results | Detection points | Excessive points | Test results | Detection points | Excessive points | ||
| Coal dust/(mg/m3) | 4 | 0.50–18.30 | 631 | 536 | / | / | / | 0.50–14.10 | 93 | 81 |
| Other dust/(mg/m3) | 8 | 0.30–12.70 | 235 | 64 | / | / | / | 0.50–12.00 | 45 | 13 |
| Noise/dB | 85 | 70.50–88.60 | 443 | 53 | 65.30–92.40 | 419 | 71 | 62.10–89.85 | 436 | 45 |
| Carbon monoxide/(mg/m3) | 20 | / | / | / | 0.50–14.20 | 135 | 0 | 0.70–18.20 | 384 | 0 |
| Hydrogen sulfide/(mg/m3) | 10 | / | / | / | 0.60–12.30 | 150 | 0 | 0.60–15.90 | 137 | 0 |
| Benzene/(mg/m3) | 3 | / | / | / | <0.60 | 132 | 0 | <0.60 | 50 | 0 |
| Toluene/(mg/m3) | 50 | / | / | / | <1.00 | 132 | 0 | <1.00 | 50 | 0 |
| Xylene/(mg/m3) | 50 | / | / | / | <3.00 | 132 | 0 | <3.00 | 50 | 0 |
| Cresol/(mg/m3) | 2 | / | / | / | 0–0.35 | 132 | 0 | <0.22 | 50 | 0 |
| Phenol/(mg/m3) | 2 | / | / | / | 0–0.94 | 132 | 0 | <0.22 | 50 | 0 |
| Naphthalene/(mg/m3) | 50 | / | / | / | <0.30 | 115 | 0 | <0.30 | 30 | 0 |
| NOx/(mg/m3) | 5 | / | / | / | 0.19–1.19 | 144 | 0 | 0.18–1.23 | 68 | 0 |
| Ammonia/(mg/m3) | 20 | / | / | / | 0.76–15.1 | 115 | 0 | / | 46 | 0 |
/, indicates that occupational disease hazard factors are not detected in routine monitoring.