Tenth, median and 90th centiles of each pollutant (ward annual average, 1996)
| Pollutant | p10 | p50 | p90 | p10–p90 range |
| SO2 (μg/m3) | 3.87 | 7.86 | 14.99 | 11.12 |
| NO2 (μg/m3) | 21.48 | 35.11 | 47.78 | 26.30 |
| PM10 (μg/m3) | 18.84 | 21.97 | 26.40 | 7.56 |
p10, tenth centile; p50, 50th (median) centile; p90, 90th centile.