Agra, Oct. 20 -- Recurring phenomenon of green patches appearing on the inlay work on northern walls of the Taj Mahal has yet again become a matter of concern for ASI officials.

The ASI officials at the Taj Mahal have written to the science branch of ASI for remedial measures to tackle this 'attack' by the 'Goeldichironomus' insect for which the quality of water in the Yamuna is yet again under scanner.

The issue has been a matter of concern for the Archaeological Survey of India since 2016. Although the phenomenon has been observed on the white surface of the Taj Mahal since 2015, it was previously limited to the hot months of May and June but now these green marks appear during months of October also as seen in recent years when water...