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No explanation better than a screenshot:

Can you provide the savegame?

Lots of mods installed: Its harder to see with the other production area generating pollution, but it still occurs that the pollution runs along the edges of the map.

I hope this helps

Ok, so it is not bug after all, the pollution goes off the map, and it is jut not shown there.

If pollution goes outside the map I would assume whats visible along the map edge wouldn't happen?
From screen it seems that instead of going outside of the map pollution expands along the edge.

orzelek wrote:If pollution goes outside the map I would assume whats visible along the map edge wouldn't happen?
From screen it seems that instead of going outside of the map pollution expands along the edge.

Yea it doesn't explain the behaviour in the first screenshot, which seems as though the pollution is hitting the edge, stopping, and then being blown along by the wind

It is there, it is just not displayed as the chart logic ignores chunks that are not generated.