IIT Study Finds Air Pollution Forming Black Crust on Humayun's Tomb

A new study by IIT researchers has found that air pollution is accelerating the deterioration of Humayun's Tomb in New Delhi. The study reveals that pollutants are forming a black crust on the monument's red sandstone surfaces. This black crust is weakening the structural integrity of the sandstone over time. The findings raise serious concerns about the long-term preservation of the UNESCO World Heritage Site.
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