Archaeologists said the lengthy period was needed to properly and safely clean particles from the four minarets and the main dome of the famed monument to love.
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Authorities have taken numerous steps in recent years to try to protect the 17th-century monument from pollution coming from the busy city of Agra nearby, including banning local coal-powered industries.
The mud pack cleaning was announced last year, followed by a local ban on the common practice of burning cow dung for fuel, in order to reduce the carbon deposits on the Taj's walls.
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The Times of India newspaper outlined an action plan by authorities after submitting a Right To Information request to access government documents.
The Taj - India's top tourist attraction -- was built by Mughal emperor Shah Jahan as a tomb for his beloved wife Mumtaz Mahal, who died giving birth in 1631.
It has drawn a string of world leaders and royalty including former US president Bill Clinton, while Diana, the late British princess, was famously photographed alone on a marble seat there in 1992.
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