Air pollution can change our brain. A study shows how car fumes change how parts of our brain connect with other parts. The research found that car fumes changed our brain's connectivity in two hours. A researcher was surprised by his research. He said: "For many decades, scientists thought the brain may be protected from the harmful effects of air pollution." He said his study shows there is a connection between air pollution and thinking.

The study was on 25 adults. They breathed car fumes in a laboratory. Scientists took brain scans of the adults for two hours. The scans showed that the thinking networks in the brain changed. There were fewer connections between the networks. Another professor was worried by how traffic pollution changed the networks. She said people should close car windows when in traffic. The brains of the 25 people were OK after they breathed clean air.