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Crowds gather to visit the Taj Mahal in Agra on January 3, 2018. 
India is to restrict the number of daily visitors to the Taj Mahal in an effort to preserve the iconic 17th-century monument to love, its biggest tourist draw. Millions of mostly Indian tourists visit the Taj Mahal every year and their numbers are increasing steadily as domestic travel becomes more accessible.
 / AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)
Crowds gather to visit the Taj Mahal in Agra on January 3, 2018. 
India is to restrict the number of daily visitors to the Taj Mahal in an effort to preserve the iconic 17th-century monument to love, its biggest tourist draw. Millions of mostly Indian tourists visit the Taj Mahal every year and their numbers are increasing steadily as domestic travel becomes more accessible.
 / AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)

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    Pollution is damaging iconic Taj Mahal

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Pollution is damaging iconic Taj Mahal

Years of smog, tourists and insects are damaging India's iconic mausoleum the Taj Mahal and causing parts of the exterior to turn yellow-green. CNN's Robyn Curnow reports activists are calling on the country's leaders to preserve it.

Pollution is damaging iconic Taj Mahal

Years of smog, tourists and insects are damaging India's iconic mausoleum the Taj Mahal and causing parts of the exterior to turn yellow-green. CNN's Robyn Curnow reports activists are calling on the country's leaders to preserve it.