Kathua (J&K), Apr 16 (ANI): Jammu and Kashmir Pollution Control Board Regional Director Showkat Choudhary on Saturday said that he had undertaken a surprise visit to various brick kilns in Kathua district on the direction of the National Green Tribunal (NGT) and come to the conclusion that pose a major threat to the environment. He said a majority of these brick kilns are violating environmental clearance norms. Choudhary said these kilns have been warned to stop all illegal activities or be ready to face stern legal action.