In a written reply in Rajya Sabha, Tourism Minister Mahesh Sharma said that it has come to the notice of the government about the change in colour of the iconic marble mausoleum due to faeces and dirt by the insect called Geoldichironomous.
The Minister, however, said, "this is a temporary phenomena as original colour and texture of marble is regained after simple cleaning treatment and washing the affected surfaces."
On action taken by government to check the environmental degradation of Taj Mahal, he said conservation and preservation work of this heritage is "attended regularly" by the ASI.
"The ambient air quality is also monitored constantly. The protected area is maintained neat and clean with sufficient growth of plants in open areas of Taj Mahal and across the Yamuna river at Mehtab Bagh to minimise the effect of harmful substances," he said.