The ICAO Council adopts standards and recommended practices concerning air navigation, its infrastructure, flight inspection, prevention of unlawful interference, and facilitation of border-crossing procedures for international civil aviation.
EAD issues No Objection Certificates (NOCs) or permits for construction and operation to developers or companies involved in. development and infrastructure projects to ensure that they implement necessary measures to protect the environment during. the Construction, Operation, and Decommissioning phases of the project.
In general, a NOC is a letter indicating the writer of the letter has no objection to the terms contained within said letter. Sounds very meta, but basically it's like saying 'I have no objection to what I'm writing about, and this is legal evidence stating so.'.