Delhi Air Pollution Threatens Red Fort's Historic Integrity

Imagine the Red Fort is getting sick because the air is dirty.

Scientists studied the fort and found it covered in a black crust made of bad stuff from cars, factories, and building work.

This crust is eating away at the red stone, making it crack and crumble.

The air pollution is made of tiny bits of dust and smoke called PM2.5 and PM10.

When it rains, the bad stuff gets worse and damages the walls.

The fort, which is a symbol of India’s history, was built long ago.

Scientists say the fort needs help before it gets too damaged, which means it will need protective coatings or treatments.