Only small, micro-level eco-friendly industries permitted in TTZ: NGT SECTIONS Last Updated: Feb 05, 2021, 02:12 PM IST Share Synopsis The green panel said the project in question is a 'red category' project involving blasting within 10 km of TTZ which is not permissible and the impugned EC is liable to be set aside. iStock TTZ is an area of about 10,400 sq km spread over the districts of Agra, Firozabad, Mathura, Hathras and Etah in Uttar Pradesh and the Bharatpur district of Rajasthan. NEW DELHI: Only small, micro and macro-level industries which are eco-friendly, non-polluting or necessary to secure essential amenities can be allowed in Taj Trapezium Zone (TTZ), the National Green Tribunal has said.