Table 2. Distribution of enterprise scale and ownership type with industries exposed to benzene in six provincial-level administrative divisions of China in 2020.
| Item | Enterprise number | Median of CTWA (range) (mg/m3) | Number of enterprises exceeding PC-TWA (%) |
| Abbreviations: CTWA=concentrations of time weighted average; PC-TWA=permissible concentration-time weighted average. | |||
| Enterprise scale | |||
| Large | 40 | 0.60 (0.05−2.00) | 0 |
| Medium | 228 | 0.60 (0.040−10.19) | 2 (0.88) |
| Small | 1,603 | 0.60 (0.001−67.08) | 9 (0.56) |
| Mini-sized | 970 | 0.60 (0.001−86.30) | 3 (0.31) |
| Ownership type | |||
| Hong Kong, Macao, and Taiwan-invested enterprises | 37 | 0.60 (0.06−2.00) | 0 |
| joint-equity | 1,661 | 0.60 (0.001−86.30) | 8 (0.48) |
| Private | 898 | 0.60 (0.004−67.08) | 5 (0.56) |
| Collective | 42 | 0.60 (0.03−3.80) | 0 |
| Foreign | 76 | 0.60 (0.01−2.00) | 0 |
| State-owned | 47 | 0.60 (0.04−4.10) | 0 |
| Joint-operate | 6 | 0.60 (0.15−6.00) | 0 |
| Unrevealed | 74 | 0.60 (0.01−14.20) | 1 (1.35) |
| Total | 2,841 | 0.60 (0.001−86.30) | 14 (0.49) |