SimCity 4/Pollution

This article talks about the 3 kinds of pollution.

Air pollution
Air pollution is started by factories,industry,farms and some airports.Air pollution causes your sims to go since people dosen't want dirty air and breathe in it.To prevent it,avoid gas plants and go on with the wind power and maybe later,you can use the solar power plant.Another way is to put parks and trees.Enough of them will reduce air pollution.

Water pollution
Caused by farms and industry.Farms bring in more pollution than industry cause of too much fertilizers.If you pipes in areas where pollution is in,later your enviroment advisor will complain about the pollution and then ask you to build a water treatment plant.Ways to prevent them is by avoiding the pipes from getting there and build a water treatment plant.

Traffic pollution
This kind is yet the most to be seen.High congestion causes the transportation advisor to complain and making you neither upgrade them(If its the streets) or make a street intersection(If its road).