* Aircraft: 
* Anthro: 
* BioBurn: 
* Biogenic: 
* Fert: 
* Lightning: 
* Natural: NH3 
* Ocean: 
* PlantDecay: ALD2 EOH 
* Seabirds: 
* Ship: NO2 NO O3 
* Soil: 
* Total: NO2 NO 
* VolcDegas: 
* VolcErupt: