When you take a walk around your neighborhood have you ever seen trash on the ground or blowing in the streets?
Maybe it got there by accident or maybe someone threw it there on purpose, this is called littering. Littering is a type of pollution that occurs when someone throws trash away in places it does not go!
Most of the time people do not realize the affects that pollution has on the world. In the United States it is against the rules to litter.
There are three main forms of pollution: air, water, and land.