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(a)
| Mean (×10−5 μg/m³) | Median (×10−5 μg/m³) | Interquartile range (×10−5 μg/m³) | |
|---|---|---|---|
| Crymlyn Burrows | |||
| 2003 | 3.7 | 3.0 | 2.5 |
| 2005 | 0.8 | 0.6 | 0.5 |
| 2006 | 10.8 | 8.2 | 6.8 |
| 2007 | 29.4 | 24.2 | 17.1 |
| 2008 | 22.0 | 16.5 | 15.2 |
| 2009 | 10.3 | 7.7 | 7.1 |
| 2010 | 4.9 | 3.9 | 3.0 |
| Marchwood | |||
| 2006 | 121.5 | 80.0 | 101.6 |
| 2007 | 186.3 | 127.7 | 149.9 |
| 2008 | 229.5 | 139.5 | 200.8 |
| 2009 | 59.6 | 44.5 | 50.3 |
| 2010 | 48.9 | 36.4 | 32.2 |
