Okay kiddo, let's talk about Times Beach, Missouri. Back in the olden days, people used to sprinkle a thing called "oil" on the roads to keep the dust down. But sometimes, that oil had a bad thing called dioxin in it. Dioxin can be very harmful to people and animals.
So, in Times Beach, they used that oil with dioxin for many years. But then, people started getting sick and they found out it was because of the dioxin in the oil. So, the government had to step in and make everyone leave the town of Times Beach because it wasn't safe to live there anymore.
The government had to spend a lot of time and money cleaning up the town so that it would be safe for people and animals to live there again. And now, many years later, Times Beach is a safe and healthy place to be.