If a chunk's pollution is greater than 20, each enemy spawner absorbs 20 + 0.01 * every 64 ticks, otherwise it absorbs 3 times the amount of pollution needed for the most expensive unit it can spawn for the current evolution factor. The effect can be turned off by disabling animated water in the graphics settings. Any water near the source of pollution will turn green, which is a visual-only effect. Biters who find themselves in a polluted area will attempt to reach the source of pollution and destroy it. Pollution attracts biters to the Player's factory. Spawners absorb a great amount of pollution, and use this to assign enemies to attacks.Trees also absorb some pollution (See #Trees).So the more the pollution spreads, the more is absorbed. Every chunk (32x32) of map slowly reduces the pollution it covers (See #Chunks).But every one of the 4 surrounding spreads 2.0 pollution 'back' to the center chunk, so it only loses 24.0 + absorbed value. Pollution can generate new chunks if it needs to spread to them.įor example, a chunk with 400.0 pollution and 4 adjacent chunks with 100.0 pollution each, raises the pollution in all adjacent chunks by 8.0 while reducing its own pollution by 32.0. As soon as a chunk has reached 15.0 pollution it starts spreading in all four cardinal directions at a rate of 2% per 64 ticks.

Factorio pollution