| Approximate | No. of Particles | ||
|---|---|---|---|
| Type of | Radius | (per cm3) | |
| Particle | (micrometers) | Range | Typical |
| Small (Aitken) CN | $\lt$ 0.2 | 1000 - 10,000 | 1000 |
| Large CN | 0.2 to 1.0 | 1 - 1000 | 100 |
| Giant CN | $\gt$ 1.0 | 1 - 10 | 1 |
| Fog and Cloud Droplets | $\gt$ 10 | 10 - 1000 | 300 |
| [return $\leftarrow$] |