ppgao: Persistent Pollution Generation Agriculture
Variable
Persistent pollution sector
Persistent Pollution Generation Agriculture [Pollution units/year]
ppgao = aiph * al * fipm * amti

ppgao in the updating graph: ( how to read )
In nodes
aiph : agricultural input per hectare
al : Arable Land
amti : agricultural material toxicity index
fipm : fraction of agricultural inputs from persistent materials
Out nodes
ppgr : persistent pollution generation rate