Original Description: The pollution condenser will make any air or water pollution in your city disappear! Thanks to everyone who made this possible! your all fantastic. lol. hehe. Cori Edit: Nothing has changed in the lot itself, but it seems many peeps were mislead to believe all air and water pollution would disappear if plopping one of this lot. That is untrue. There is no affect on traffic pollution and the others are simply reduced by 1,000 over 250 tiles. Located in the Parks Menu. Here's a before and after pic in the Big City Tutorial using @Simizen's Air Quality Index Dataview: Before:   After: Note: That was after about 8 months running time.
And here's a little table I made showing the stats: Lot Stats Lot Size 4 x 4 Plop Cost §5,000 Total Monthly Cost §5 Bulldoze Cost §100 Park Effect 100 over 100 tiles Landmark Effect 20 over 5 tiles Power Consumed 0 MWh/Month Water Consumed 0 m3/Month Air Pollution -1,000 over 250 tiles Water Pollution -1,000 over 250 tiles Garbage Pollution 0 over 0 tiles You can plop multiple to increase the pollution reduction effects.