Fixed. It was a simple math error since it is not a fixed value but rather a multiplication depending on another value.
Bob has since changed how his emissions work for the electronic assemblers, having a function that defines pollution per minute as a fixed value rather than the older implementation I used. I adjusted my multiplication so that it adds up to less usage per tier, in line with Bobs. Check the changelogs once the update is pushed :)
There are two other small adjustments too, regarding the electronic assemblers. Nerfed them a bit.