| Category Code | Name of category | Method | AD | EF | Key Category |
|---|---|---|---|---|---|
| 6 | Other Sources | see sub-categories | |||
| consisting of / including source categories | |||||
| 6.A.1 | Ammonia emissions from human sweating and breathing | T1 | NS | D | |
| 6.A.2 | Ammonia emissions from pets | T1 | NS | D | |
| 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 | |||