itch.io

its because the speed of the gaining emissions not just how much so maybe it would be that if all of the things start for 40 seconds which is a tick or whatever its called so if its faster then 40 like 39 you will gain slightly more or less emissions per tick

the amount of emmisions is generated every time that sector produces something. eg: industry could produce 9 pollution every 21 seconds. 

the amount per round for each sector would be calculated like:

pollution produced per round = (pollution produced / production time) * round time

and the total would just be the sum of all sectors