Combustion products of fossil fuels
| Carbon dioxide (as C) | Sulphur dioxide | PM10 | Nitrogen oxides | Carbon monoxide | |
|---|---|---|---|---|---|
| *Lower limits for hotspots in tonnes/km2/year; †children migrating >1.0 km and with one address within 1.0 km of nearest hotspot and the other address outside 1.0 km. | |||||
| Hotspot criteria* | 1264 | 10 | 4 | 25 | 160 |
| Number of hotspots | 64625 | 12817 | 39744 | 53875 | 13371 |
| Number of children† | 1246 | 2008 | 2908 | 2072 | 2943 |
| Outward migration | 838 | 1034 | 2074 | 1501 | 2324 |
| Inward migration | 408 | 974 | 834 | 571 | 619 |
| Ratio out/in | 2.054 | 1.062 | 2.487 | 2.629 | 3.754 |