Pollution is a thing that is formed in 4 ways, They are Air,Noise,Soil and Water.
Air-Air pollution is caused by smoke,Like car petrol smoke,Chimnneys, Ciggrate etc.
Noise-Noise pollution is caused by a very hard noise,Like DJ's,Partys etc.
Soil-Soil pollution is happend by a way caused inside soil,Like throw a can in the soil,And if the soil is fertile,The soil becomes un-fertiled.
Water-Water Pollution is finally caused by oil and garbage, If we through ol and garbage for example in the sea's.
If you want help,Feel free to ask.
-Ritvick