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I noticed the pollution factor going up way more than the promised +10% while adding two productivity 3 modules in my centrifuge.
Base pollution centrifuge: 5.6
One productivity 3 module (+10%): 11.088
Two productivity 3 modules (+20%): 17.472

Pollution is also based on the power usage, which is also increased by the productivity module,
Are you sure this is not what you are observing?

That would explain! I'm not yet a factorio veteran, and I posted this because I downloaded the 16.35 beta today. I guess this topic is up for closing . Thanks for the fast reply