(a) whether Taj Mahal is turning yellow due to pollution from diesel/petrol run vehicles;
(b) if so, whether the Ministry of Environment and Forests has taken up the matter with the Ministry of Petroleum and Natural Gas to ensure regular supply of CNG in Agra to combat the situation;
(c) if so, the reaction of the Ministry of Petroleum and Natural Gas thereto; and
(d) if not, the reasons therefor?