Exposure concentrations obtained from personal sampling when paving with conventional and CRM asphalt
| Exposure parameters | Conventional asphalt | CRM asphalt | P values* | ||
| n | Median (5%–95%) | n | Median (5%–95%) | ||
| Respirable dust (µg/m3) | 19 | 240 (10–610) | 31 | 160 (10–1180) | 0.73 |
| Total dust (µg/m3) | 19 | 180 (10–1180) | 18 | 210 (10–3070) | 0.92 |
| Total airborne PAHs (µg/m3)† | 19 | 2.75 (0.71–6.24) | 18 | 2.55 (1.32–9.81) | 0.23 |
| Benzothiazole (µg/m3) | 11 | 0.37 (0.17–2.63) | 14 | 2.09 (1.01–3.69) | <0.001 |
| Nitrosamines (µg/m3)‡ | 15 | 0.060 (0.020–0.52) | 26 | 0.070 (0.020–1.51) | 0.60 |
*P values were derived from Mann-Whitney test for non-parametric continuous variables.
†Particle and gas phase; sum of 32 PAHs.18
‡Sum of 9 nitrosamines.
CRM, crumb rubber modified; PAH, polycyclic aromatic hydrocarbon.