Table 4.
Descriptive statistics of airborne particle metrics. London, 2012.
| Percentiles |
|||||
|---|---|---|---|---|---|
| Variables | Mean | Range | 25th | 50th | 75th |
| PNC (cm− 3/1000) | 12.12 | 5.34–25.02 | 9.16 | 11.49 | 14.57 |
| PM component | |||||
| Chloride (μg/m3) | 1.37 | 0.20–6.40 | 0.50 | 1.10 | 1.80 |
| Nitrate (μg/m3) | 3.33 | 0.10–34.40 | 0.70 | 1.60 | 4.00 |
| Sulphate (μg/m3) | 1.67 | 0.20–13.50 | 0.80 | 1.30 | 2.10 |
| BS (μg/m3) | 5.88 | 1.11–27.78 | 3.33 | 4.44 | 7.41 |
| PM size | |||||
| PM10 (μg/m3) | 17.70 | 4.00–76.00 | 11.00 | 14.00 | 20.75 |
| PM2.5 (μg/m3) | 11.31 | 2.00–61.00 | 6.00 | 8.00 | 13.00 |
| Coarse (μg/m3) | 6.60 | 0–31.00 | 4.00 | 6.00 | 8.00 |
| PM source apportionment | |||||
| PPM10 (μg/m3) | 4.11 | 1.00–14.40 | 2.30 | 3.20 | 5.30 |
| NPPM10 (μg/m3) | 9.49 | 1.17–29.61 | 6.12 | 8.46 | 11.88 |
| NPPM2.5 (μg/m3) | 3.42 | 0–17.54 | 1.35 | 2.63 | 4.33 |
| NPcoarse (μg/m3) | 6.40 | 0.24–13.47 | 4.69 | 6.21 | 8.00 |