NEW DELHI — Taj Mahal, the white-marble mausoleum in the northern Indian town of Agra, is turning yellow due to air pollution, a parliamentary panel report said.

The 17th-century tomb is getting a “yellow tinge to the marble surface,” despite conservation efforts, the panel said in its report presented to the parliament yesterday.

Agra, a town of 1.2 million people with leather factories and the nearby Mathura refinery, has high levels of so-called suspended particulate matter, brought about by a mixture of factory emissions, vehicle exhaust, dust, and construction material. These are causing the Taj Mahal to change color, the panel said.

The 359 year-old Taj Mahal, which attracts three million tourists every year, was built by Emperor Shah Jahan and houses his grave and that of his favorite queen, Mumtaz Mahal.

The panel recommended that the state-run Archaeological Survey of India take measures to retain the glory of shimmering white marble used in the Taj Mahal. A clay-pack treatment is being carried out to restore the color, the report said.

The Taj Mahal, which has featured on the World Heritage Sites list of the United Nations over the past two decades, is part of the so-called golden triangle tourist itinerary of New Delhi, the desert city of Jaipur in Rajasthan, and Agra.

The government has undertaken a $9.6 million project to revamp the city and the Taj Mahal, tourism minister Ambika Soni said in Parliament on May 8. The project will be completed in three years.