Taj Mahal is turning into yellow. This part shows you that what are the things which pollutes Taj Mahal sculptures.

4. More recent threats have come from environmental
pollution on the banks of Yamuna River including acid
rain due to the Mathura Oil Refinery, which was opposed
by Supreme Court of India directives. The pollution has been
turning the Taj Mahal yellow. To control the pollution, the
Indian government has set up the Taj Trapezium Zone
around the monument .
Concerns for the tomb's structural integrity have recently
been raised because of a decline in the groundwater level in
the Yamuna river basin which is falling at a rate of around 5
feet a year.

10. Pollution in Yamuna River has
increased rapidly and the
protection of this river includes
several governmental steps.
Yamuna is unfortunately one
of the most polluted rivers in
the world, especially in the
banks near New Delhi, the
capital of India. Almost 57% of
the city’s waste is dumped
into the river. Numerous
attempts have been made to
clean it; however the efforts
have brought few changes.

12. A report filed by the Central Pollution
Control Board (CPCB) in the Supreme
Court on Thursday shows that a total
pollution load of over 300 tonnes flow
into river Yamuna every day from 22
drains connecting it in Delhi and its
neighboring regions.
There has been no mechanism to
protect the river, a water source for the
teeming National Capital, from the
untreated sewage being dumped into it
through drains, which were actually built
to carry storm water.