Tunnels | Outdoor construction work | |||||||
---|---|---|---|---|---|---|---|---|
Airborne pollutants | HS | No. | GM | 95% CI6-150 | No. | GM | 95% CI6-150 | |
Total dust | 10 mg/m3 | 366 | 3.6 | 3.2 to 4.0 | 32 | 1.05 | 0.85 to 1.29 | |
Respirable dust | 5 mg/m3 | 372 | 1.2 | 1.09 to 1.31 | 37 | 0.21 | 0.18 to 0.25 | |
α-quartz | 0.1 mg/m3 | 302 | 0.034 | 0.028 to 0.041 | 37 | 0.003 | 0.002 to 0.003 | |
Oil mist | 1 mg/m3 | 186 | 0.50 | 0.39 to 0.63 | 16 | 0.12 | 0.08 to 0.18 | |
Nitrogen dioxide | 2 ppm (ceiling value) | 80 | 0.50 | 0.4 to 0.7 | 0 | – | – |
HS= Norwegian hygienic standards; GM = geometric mean.
↵6-150 Confidence interval of geometric mean (GM).