im using pollution of realms mod that tracks fuel burning and when fuel burnt/used the pollution being created. im my atention was attracted to the fact that diesel do not create any pollution, further investigation lead to the fact that theres no nbt info in that block for burning fuel.

Well, what would that info in NBT look like? I really don't know much about PotR. afaik this mod is closed source and doesn't provide an API for mods to use.

NBT is when furnace or other mechanism that consumes fuel have its nbt code, others mods can track it, but diesel generators have hidden that nbt or dont have it at all. data get block ~ ~ ~ at block while its working for example furnace will show nbt code

Yeah but does you mean like how does PotR read these values. I mean do you add a config to read a value from nbt or what? What kind of nbt tag does PotR look for?

Basically my question is: does PotR need a Active: 1b tag in nbt or something else

If i understood correctly, yes: https://legacy.curseforge.com/minecraft/mc-mods/pollution-of-the-realms/pages/adding-a-custom-emitter