Table 1.
Descriptive statistics of respiratory mortality and airborne particle metrics. London, 2002–2005.
| Percentiles |
|||||
|---|---|---|---|---|---|
| Variables | Mean | Range | 25th | 50th | 75th |
| Deaths (per day) | 21.60 | 6.00–58.00 | 16.00 | 21.00 | 26.00 |
| PNC (cm− 3/1000) | 21.19 | 5.39–52.44 | 14.63 | 19.97 | 25.91 |
| PM component | |||||
| Chloride (μg/m3) | 1.31 | 0.01–9.06 | 0.25 | 0.88 | 1.98 |
| Nitrate (μg/m3) | 3.77 | 0.03–30.89 | 1.35 | 2.44 | 4.47 |
| Sulphate (μg/m3) | 2.93 | 0.23–20.63 | 1.51 | 2.25 | 3.89 |
| BS (μg/m3) | 6.23 | 1.40–31.33 | 4.00 | 5.40 | 7.60 |
| PM size | |||||
| PM10 (μg/m3) | 26.63 | 5.00–119.00 | 17.00 | 23.00 | 32.00 |
| PM2.5 (μg/m3) | 18.85 | 1.00–104.00 | 11.00 | 15.00 | 22.00 |
| Coarse (μg/m3) | 7.89 | 0–33.00 | 5.00 | 7.00 | 10.00 |
| PM source apportionment | |||||
| PPM10 (μg/m3) | 4.63 | 0.80–39.10 | 2.50 | 3.70 | 5.60 |
| NPPM10 (μg/m3) | 11.50 | 0–61.00 | 7.00 | 9.90 | 14.20 |
| NPPM2.5 (μg/m3) | 5.75 | 0–32.60 | 2.40 | 4.20 | 7.40 |
| NPcoarse (μg/m3) | 5.99 | 0–42.20 | 4.00 | 5.60 | 7.40 |