Scientists have good news about children in London. In 2019, the city started a clean air zone. This zone stops old cars from driving in central areas.
The goal was to reduce bad air. Researchers studied 3,400 children for five years. They checked how well the children could breathe.
At first, many children had small or weak lungs. This was because the air was very dirty. Now, the scientists are happy.
The children's lungs are growing fast and getting stronger. The clean air helps them run without getting tired. Their health is much better now because the pollution is lower.
This shows that clean air zones really work for families.