What happened?

Randomly my pollution and asthma epidemic went away and next turn, having done nothing myself, it came back and I get random changes in revenue and the like. What happened?

Also, what is wrong with this code?

dump radioactive wastes is very bad for the air quality and…

Yes but the code itself doesn’t work. Why?

In that it never triggers? your inputs to it (the random bit) seem very low. it might be too low to ever be triggered. try raising those.