Table 1. Distribution of noise exposure levels among the manufacturing industry in different divisions — China, 2020.
| Division* | Total number of enterprises | Total number of workers | Environmental noise exposure level [dB(A)] | Individual noise exposure level LEx,8h/LEx,40h†[dB(A)] | The proportion of individual noise exposure levels ≥85 dB(A) (%) | |||
| Number of samples | Median (IQR) | Number of samples | Median (IQR) | |||||
| * P<0.001. † LEx,8h: Normalization of equivalent continuous A-weighted sound pressure level to a nominal 8 hours working day. LEx,40h: Normalization of equivalent continuous A-weighted sound pressure level to a nominal 40 hours working week. | ||||||||
| Manufacture of furniture | 2,430 | 45,826 | 15,750 | 83.2 (80.2–86.5) | 13,955 | 81.7 (77.4–84.8) | 24.01 | |
| Printing and reproduction of recorded media | 2,148 | 39,730 | 9,457 | 81.1 (78.0–83.8) | 9,022 | 80.5 (76.3–83.4) | 15.21 | |
| Manufacture of coke and refined petroleum products | 359 | 27,552 | 3,470 | 82.9 (78.8–87.1) | 2,196 | 78.3 (73.8–82.0) | 9.39 | |
| Manufacture of chemicals and chemical products | 1,401 | 40,121 | 8,354 | 80.1 (75.9–83.5) | 6,439 | 77.4 (72.7–81.0) | 7.59 | |
| Manufacture of other non-metallic mineral products | 8,228 | 166,938 | 41,471 | 83.8 (80.3–88.9) | 36,066 | 82.0 (77.3–86.9) | 32.08 | |
| Casting of iron and steel | 808 | 44,022 | 6,821 | 82.6 (78.7–86.8) | 5,615 | 80.5 (76.4–84.2) | 21.52 | |
| Casting of non-ferrous metals | 1,001 | 55,640 | 7,733 | 82.2 (78.6–85.8) | 6,202 | 80.5 (76.3–84.2) | 20.39 | |
| Manufacture of metal products | 1,368 | 35,715 | 7,688 | 83.2 (80.2–87.1) | 7,224 | 82.2 (78.8–85.9) | 29.01 | |
| Manufacture of motor vehicles | 1,533 | 70,246 | 10,278 | 82.8 (79.7–86.7) | 9,917 | 82.2 (78.7–85.6) | 27.76 | |
| Manufacture of electrical equipment | 102 | 7,928 | 836 | 82.4 (79.8–85.5) | 783 | 81.8 (78.4–84.9) | 24.58 | |
| Total | 19,378 | 533,718 | 111,858 | 82.8 (79.3–87.0) | 97,419 | 81.3 (76.9–85.0) | 25.14 | |