If you can, make it so that the player/mod pack maker can configure which block produces what amount of pollution, plus if it's possible to detect when a block is "On" (aka actively doing something to cause pollution) bonus points.Thanks ! @Pyure and I have been discussing this concept for a few modpacks now. In the real world, you don't simply burn a lot of fossil fuels (near where you live and where you grow crops !) and expect everything to be peachy. It will introduce another mechanic for players to be creative with how to solve.
I would even say that Lava is a source of pollution. You don't really see pools of lava surrounded by lush green fields. Basing the idea on Thaumcrafts Taint is a great idea. That was a perfect pollution system.
Look forward to seeing Acid Rain decimating your tree farms in a later version