| BOX 3. Approximate contributions to PM10 Concentrations 1998 | ||||
| Type of Particle | Source Location | Main Source Categories | Main Source Types | Typical Contribution to Annual Mean Concentration (mg/m3 gravi.) |
| Coarse 2.5-10µm | Immediate Local (very close) | Traffic | resuspended dusts tyre wear |
1 - 6 |
| Industry | fugitive dusts stockpiles quarries construction |
variable | ||
| Urban Background | Traffic | resuspended dusts tyre wear |
1 - 4 | |
| Industry | fugitive dusts stockpiles quarries construction |
0.5 - 2 | ||
| Regional (including distant sources) | Natural | resuspended dust/soil sea salt biological |
2 - 3 1 - 2 1 |
|
| Fine <2.5µm | Immediate Local (very close) | Traffic | vehicle exhaust | 1 - 6 |
| Industry | combustion industrial processes | variable | ||
| Domestic | coal combustion | variable | ||
| Urban Background | Traffic | vehicle exhaust | 1 - 4 | |
| Industry | combustion industrial processes | 0.5 - 2 | ||
| Domestic | coal combustion | variable | ||
| Regional (including distant sources) | Secondary | power stations industrial processes vehicles | 6 - 16 | |
| Primary (Europe) | vehicles combustion processes | 1 - 2 | ||
| Natural | sea salt | 0.5 - 1 | ||