The principal bench of National Green Tribunal (NGT) has summoned the Director, NEERI and Member Secretary, Punjab Pollution Control Board (PPCB) to explain the delay in filing the status report and what immediate measures can be taken to resolve the problem of groundwater contamination in Punjab's Sangrur.A bench of Chairperson Justice Prakash Shrivastava, Justice Sudhir Agarwal, Dr. A....