Table 1 Summary statistics
| Â | All areas | Urban areas | Rural areas |
|---|---|---|---|
Residential postcodes: n (%) | 1,202,578 | 886,683 | 315,895 |
(100%) | (74%) | (26%) | |
LSOA: n (%) | 32,179 | 26,632 | 5557 |
(100%) | (83%) | (17%) | |
Population in mid-2006: n (%) | 52,122,136 | 43,140,763 | 8,981,373 |
(100%) | (83%) | (17%) | |
2010 annual mean concentration (arithmetic mean), μg/m3: mean (sd) | |||
Total PM2.5 | 9.21 (0.71) | 9.32 (0.66) | 8.89 (0.75) |
Nitrate PM2.5 | 1.91 (0.25) | 1.90 (0.23) | 1.95 (0.31) |
Sulphate PM2.5 | 1.49 (0.17) | 1.51 (0.17) | 1.42 (0.17) |
Primary PM2.5 | 1.44 (0.39) | 1.55 (0.37) | 1.12 (0.27) |
PM2.5–10 | 7.98 (0.63) | 7.97 (0.53) | 8.01 (0.84) |
PM10 | 17.19 (0.92) | 17.29 (0.86) | 16.89 (1.01) |
O3 | 68.46 (3.54) | 67.66 (3.47) | 70.69 (2.68) |
2010 annual mean concentration (population-weighted mean), μg/m3 | |||
Total PM2.5 | 9.30 | 9.37 | 8.95 |
Nitrate PM2.5 | 1.91 | 1.90 | 1.97 |
Sulphate PM2.5 | 1.50 | 1.51 | 1.44 |
Primary PM2.5 | 1.51 | 1.58 | 1.15 |
PM2.5–10 | 7.96 | 7.96 | 7.97 |
PM10 | 17.26 | 17.33 | 16.92 |
O3 | 68.04 | 67.53 | 70.46 |