What are decrease in oxygen levels?

A decrease in oxygen levels means there is less air we can breathe in a certain place, like when you’re playing hide and seek in a small room and everyone runs out of breath at the same time.

Imagine you're swimming in a pool, and the water gets deeper and deeper. At first, it’s easy to swim, but as the water covers your head, you feel like you need to breathe faster, that's what happens when oxygen levels decrease. In real life, this can happen in places where people are breathing the same air, like a crowded classroom or inside a sealed container.

Think of a balloon filled with air, it’s full and bouncy. But if you let some air out, it becomes smaller and less lively. A decrease in oxygen levels is like that balloon losing air, the place where people are breathing has less "life-giving" air to go around.

Sometimes, when places get too crowded or not enough fresh air comes in, we all feel a little tired or dizzy, just like after a long game of tag!