(a) whether the Central Pollution Control Board (CPCB) has recently issued notices to many coal based power plants for non-compliance with international emission norms;
(b) if so, the details thereof;
(c) whether several coal based power plants owned by private and Government agencies situated at Thoothukudi in Tamil Nadu are releasing heavy sulphur dioxide, lead, mercury, nickel, cadmium, arsenic and other heavy metal contents; and
(d) if so, the details of such thermal power plants at Thoothukudi along with the details of effluents being released by each plant?