Carbon and dust turning the Taj dark

New research shows atmospheric carbon is wreaking havoc on the Taj, discolouring the marble. Agra is the eighth most polluted city in the world, with particulate matter levels more than twice the national average and eight times the WHO standard

Acid rain may not be the culprit

In the 1980s, SO2 emissions were identified as the main factor degrading the stonework of the Taj. Current data does not support the claim that acid rain or sulphates and nitrates are responsible for the damage