The Haryana State Pollution Control Board (HSPCB) is conducting a survey of stone crusher units in Mahendragarh and Charkhi Dadri district to examine their compliance with environmental norms. This survey follows a directive from the National Green Tribunal (NGT) to submit a detailed compliance report on these units. The NGT instructed the board to provide information on anti-pollution norms, consent to establish (CTE), and consent to operate (CTO) for each unit. HSPCB chairman P Raghavendra Rao confirmed that surveys are being conducted and the findings will be submitted to the NGT.