| Code Figure |
Meaning |
| 0 |
Reserved |
| 1 |
Aviation |
| 2 |
Lightning |
| 3 |
Biogenic Sources |
| 4 |
Anthropogenic sources |
| 5 |
Wild fires |
| 6 |
Natural sources |
| 7 |
Bio-fuel |
| 8 |
Volcanoes |
| 9 |
Fossil-fuel |
| 10 |
Wetlands |
| 11 |
Oceans |
| 12 |
Elevated anthropogenic sources |
| 13 |
Surface anthropogenic sources |
| 14 |
Agriculture livestock |
| 15 |
Agriculture soils |
| 16 |
Agriculture waste burning |
| 17 |
Agriculture (all) |
| 18 |
Residential, commercial and other combustion |
| 19 |
Power generation |
| 20 |
Super power stations |
| 21 |
Fugitives |
| 22 |
Industrial process |
| 23 |
Solvents |
| 24 |
Ships |
| 25 |
Wastes |
| 26 |
Road transportation |
| 27 |
Off-road transportation |
| 28 |
Nuclear power plant |
| 29 |
Nuclear weapon |
| 30-191 |
Reserved |
192-254
|
Reserved for Local Use
|
| 255 |
Missing
|