India's white-marble Taj Mahal is turning yellow and green as the 17th century mausoleum weathers filthy air in the world's eighth-most polluted city.
One of the seven Wonders of the World, the Taj Mahal flanks a garbage-strewn river and is often enveloped by dust and smog from belching smokestacks and vehicles in the northern city of Agra.
India's Supreme Court slammed the government for not doing enough to preserve the monument, which was built by Mughal emperor Shah Jahan as a mausoleum for his wife Mumtaz Mahal.
"If the Indian scientists and the (conservationists) can't do the things, they should be able to contact foreign experts or conservationists, those who can come and they will be readily happy to help," said environmental lawyer MC Mehta, who has been fighting to save the Taj Mahal from pollution for three decades.
Restorers have been using a paste of a clay mineral to clean the marble. It pulls away impurities from the surface and can then be washed off with water.
Activists are also concerned that the falling water table in Agra may be weakening the wooden foundations. Other worries include roads clogged with polluting vehicles and rampant construction around the mausoleum.
The change in colour has not come out of the blue. Environmentalists and historians have long warned about the risk of soot and fumes from factories and tanneries dulling the ivory monument.
Tourists visiting the monument said they hoped steps will be taken to preserve it.
"I think the Taj Mahal is one of the biggest icons of India and I think the city would be better to be cleaner and for the government to do something about this," said Francesco, a tourist from Argentina.
"Because it is a shame, you know."
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