Sources of urban air pollution
| London annual hourly average 1996 | Maximum daily UK value 1996 | EPAQS | |
|---|---|---|---|
| EPAQS, Expert Panel on Air Quality Standards (Department for Environment, Food and Rural Affairs); PM10, particulate matter with an aerodynamic diameter of less than 10 μm. | |||
| Sulfur dioxide (ppb) | 8 | 201 | 100 (over 15 minutes) |
| PM10 (μg/m3) | 30 | 380 | 50 (24 hour mean) |
| Ozone (PB) | 16 | 121 (rural site) | 50 (8 hour running average) |
| Nitrogen dioxide (PB) | 28 | 205 | 150 (1 hour mean) |
| Carbon monoxide (ppm) | 1.4 (roadside) | 15.8 (roadside) | 10 (8 hour running average) |