As per the case facts, an oil marketing company challenged a ruling from the National Green Tribunal concerning environmental regulations. The appeal to the Supreme Court sought to overturn or ... modify the NGT's directives regarding the installation of certain mechanisms. The question arose regarding the validity and enforceability of the NGT's directions concerning the installation of Vapor Recovery Systems (VRS) and adherence to CPCB guidelines by State Pollution Control Boards. Finally, the Supreme Court directed the CPCB to ensure compliance with its circular on VRS mechanism installation, making it mandatory for State Pollution Control Boards. The Court also set aside some NGT directions, instructing the CPCB to ensure strict adherence to its own guidelines and prompt action against non-compliant outlets.