Table 1.
Summary of geometric mean (GM) and geometric standard deviation (GSD), range and coefficient of variation (CV) of particle number concentration (PNC) and geometric mean diameter (GMD) of SMPS and DiscMini at the near-field (NF) and breathing zone (BZ). Data from the DiscMini at both BZ and NF station were available for all 20 volunteers, while SMPS data was available for 19 volunteers due to instrument malfunction for one volunteer.
| SMPS (NF) | DiscMini 1 (NF) | DiscMini 2 (BZ) | |
|---|---|---|---|
| Number of valid observations | 19 | 20 | 20 |
| PNC (particles cm−3) | |||
| GM of PNC | 7.74E+05 | 1.10E+06 | 1.69E+06 |
| GSD | 1.6 | 1.86 | 2.42 |
| PNC Min | 2.70E+05 | 5.23E+05 | 8.69E+05 |
| PNC Max | 1.28E+06 | 2.89E+06 | 3.85E+06 |
| CV | 60% | 86% | 142% |
| Size (nm) | |||
| GMD | 69 | 51 | 45 |
| GSD | 1.89 | 1.48 | 1.61 |
| GMD Min | 32 | 32 | 29 |
| GMD Max | 170 | 112 | 108 |
| CV | 89% | 48% | 61% |