Table 2.
Description of trip means (all phases) of UFP exposure and meteorological parameters either walking or bicycling.
| Parameter | Mode | Mean | SD | Median | Min | Max |
|---|---|---|---|---|---|---|
| Particle number (pt/cm3) | Walking | 8810 | 6827 | 6625 | 2368 | 41,329 |
| Bicycling | 11,963 | 7297 | 9521 | 1239 | 33,661 | |
| Particle size (mean; nm) | Walking | 39 | 1.7 | 42 | 12 | 81 |
| Bicycling | 38 | 15 | 38 | 15 | 74 | |
| Temperature (°C) | Walking | 16.2 | 5.7 | 16.5 | 6.8 | 27.0 |
| Bicycling | 16.5 | 5.4 | 16.6 | 6.9 | 26.9 | |
| Wind speed (m/s) | Walking | 5.0 | 1.7 | 5.0 | 2.4 | 8.3 |
| Bicycling | 4.6 | 1.7 | 4.2 | 2.0 | 9.1 |
Abbreviations: N, sample size; nm, nanometer; m/s, meters per second; pt/cm3, particles per cubic centimeter of air; SD, standard deviation; min, minimum value; max, maximum value.