Answer: Taj Mahal, Agra Fort, and Fatehpur Sikri
Notes: Supreme Court directed Forest Research Institute (FRI) to conduct a tree census in the Taj Trapezium Zone (TTZ). TTZ covers 10,400 sq km around the Taj Mahal to protect it from pollution. It includes three UNESCO World Heritage Sites – Taj Mahal, Agra Fort, and Fatehpur Sikri. 1996 Supreme Court ruling banned coal/coke use in TTZ industries, mandating a switch to natural gas or relocation. Centre formed TTZ Pollution Prevention Authority under the Environment Protection Act, 1986. TTZ has four zones: Red, Green, Orange, and White.
