Table 2: Compilation of the relationships between compartment and tunnel concentrations for BC and NOx, calculated based on linear regressions. The last two columns show the average BC/NOx-ratios in the tunnel air and in the passenger compartment air when driving through Södra Länken. Seat Tarraco was defined as an outlier and was excluded in the mean values.
Model | Cabin /tunnel BC | Cabin /tunnel NOx | Cabin /tunnel NO2 | Cabin /tunnel BC/NOx | Mean BC/NOx inside tunnel mg BC g-1 NOx-1 | Mean BC/NOx inside vehicle mg BC g-1 NOx-1 |
Volvo V60 | 0.53 | 0.80 | 0.14 | 0.75 | 15.7 | 9.4 |
Seat Leon | 0.49 | 0.77 | 0.16 | 0.18 | 13.9 | 7.9 |
Kia Ceed | 0.47 | 0.70 | 0.73 | 0.53 | 12.1 | 8.0 |
BMW 525 | 0.26 | 0.99 | 0.67 | 0.07 | 10.8 | 1.7 |
Seat Tarraco | 0.13 | 0.35 | 0.05 | 0.41 | 10.5 | 3.0 |
Renault Zoe | 0.51 | 0.59 | 0.12 | 0.43 | 11.5 | 8.6 |
Subaru Forester | 0.73 | 0.69 | 1.02 | 0.99 | 11.1 | 9.5 |
Volkswagen Passat | 0.57 | 0.89 | 0.46 | 0.62 | 11.3 | 5.6 |
Audi Q3, bensin | 0.24 | 0.67 | 0.29 | 0.40 | 10.9 | 3.7 |
Misubishi Outlander | 0.65 | 0.80 | 0.72 | 0.70 | 12.3 | 9.7 |
Mean (except Seat Tarraco) | 0.49 ± 0.11 | 0.77 ± 0.08 | 0.48 ± 0.21 | 0.52 ± 0.19 | 12.2 ± 1.1 | 7.1 ± 1.9 |