Spread seems to be correct - I just have a ton of pollution I guess. this can be closed then.

not 100% sure about lack of spread / dissipation - when I look at my current location's polution, it seems to go down by .1 every 5 seconds. Seems too slow - but maybe it's working correctly.

Image attached for the 'trees as producers'.

I'm creating no pollution at my base but it hasn't gone away. It also doesn't seem to spread. Not sure what is happening.