Scientists are starting a new study to find out if the air we breathe can make it harder for our brains to work properly.
They're looking at tiny particles in the air, called PM2.5, which can get into our bodies and even our brains.
These particles might make our brains work slower or even cause diseases like Alzheimer's, which makes it hard to remember things.
The study could help us understand how pollution affects our brains and maybe lead to new ways to protect them.
