Either the negative pollution should scale with the crafting speed (e.g. pollution:crafting speed of -180:1 for AF1, -240:1 for AF2, -600:1 for AF3), or the crafting speed should go down as the quality goes up (it currently goes up as quality goes up).

As it stands, quality effects "crafting speed" of air filtering machines, but not pollution, meaning that above-normal quality air filtering machines remove the same amount of pollution per minute as "normal" air filtering machines do, but the higher quality air filtering machines go through significantly more filters per minute.