| NFR-Code | Name of category | Method | AD | EF | Key Category |
|---|---|---|---|---|---|
| 11 | Natural Sources | see sub-categories | |||
| consisting of / including source categories | |||||
| 11.A | Volcanoes | not occurring in Germany | |||
| 11.B | Forest Fires | CS, T2 | CS | D | not included in key category analysis |
| 11.C | Other Natural Sources | see sub-categories | |||