Okay kiddo, let's talk about Directive 2008/50/EC.
Basically, it's a set of rules that grown-ups made to keep the air we breathe clean and healthy. You know how we can't see air, but we know it's all around us? Well, sometimes there are things in the air that can be bad for us and make us sick.
In Directive 2008/50/EC, the grown-ups made rules about what kind of things can be in the air and how much of them are allowed before they become dangerous for us. They also made rules about how to measure the air and make sure the rules are being followed.
These rules are important because every living thing needs clean air to breathe, and we want to make sure that everyone stays healthy. So, by following these rules, we can help keep the air clean and protect the planet we live on.