Table 2 NO2 Summary Statistics
| Â | Session 1 | Session 2 | Session 3 | All sessions |
|---|---|---|---|---|
Date | October 2007 | March 2008 | June 2008 | - |
Sampling period | 14 days | 7 days | 7 days | - |
N | 167 | 248 | 229 | 644 |
Mean (SE) (ppb) | 12.4 (0.3) | 12.2 (0.3) | 10.4 (0.2) | 11.6 (0.16) |
Minimum (ppb) | 0.8 | 1.2 | 3.7 | 0.8 |
Median (ppb) | 11.6 | 11.7 | 9.8 | 11.0 |
75th Percentile (ppb) | 15.2 | 13.6 | 11.8 | 13.4 |
95th Percentile (ppb) | 18.7 | 18.4 | 16.5 | 17.9 |
Maximum (ppb) | 30.6 | 39.4 | 30.0 | 39.4 |