Humayun's Tomb is getting discoloured by a black crust. How the air is causing it, and what can be done

For Delhi's monuments, researchers recommend regular maintenance, protective coatings and then monitoring.
Rediff.com

Air pollution damaging Humayun's Tomb, reveals IIT study

A joint study by IIT Roorkee and IIT Kanpur has found that a black crust formed by air pollution is accelerating the deterioration of Humayun's Tomb, a UNESCO World Heritage Site in Delhi. The crust, ...

Air pollution accelerating decay of Humayun's Tomb

Published in the International Journal of Architectural Heritage, the study examined black crust samples collected from ...
Hindustan Times

Humayun's Tomb in ‘perfect condition’: ASI after dargah's roof collapses near monument

The Archaeological Survey of India (ASI) on Friday said Humayun's Tomb, which is part of a UNESCO World Heritage Site, in Delhi's Nizamuddin area, is in "perfect condition" after six people were ...
The Hindu

Humayun’s Tomb museum | History goes underground in Nizamuddin

On January 24, 1556, a letter was sent to a 14-year-old Akbar that altered the course of Indian history. Humayun, the second emperor of the Mughal dynasty, was descending from his palace library’s ...