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When you put modules on electric furnaces or assembly machines it shows productivity bonus on pollution field as well.

Productivity Module 3 also increases pollution by 10%.

EDIT:

Specifically, an electric furnace has a base pollution of 1. An 80% energy consumption increase raises this to 1.8, but only reveals its effect in the energy consumption stat. The module itself adds another 10% directly to pollution, and this is shown in the pollution stat.

So it must be (+98 %) pollution, this calculation must be based on the standard amount, but not on the changed one.

It's a simple calculation if you take those numbers:
1.8 * 1.1 = 1.98
The 1.1 is a multiplier for 10%.

But yes, (+98 %).

Duplicate of 48807