As part of the Airport Carbon Accreditation application process, each airport's carbon footprint, and, according to the accreditation level chosen, the airport’s carbon management and stakeholder plans, must be independently verified by a third party before consideration by the programme Administrator WSP. Such verification can only be undertaken by verifiers who meet certain threshold qualifications and who have successfully followed a programme webinar, and passed the associated online written examination. They are then listed as approved verifiers for the purposes of the programme. A full list of approved verifiers can be viewed here.
The requirements and process of becoming an approved verifier are presented in the Verifier Manual. The document also includes requirements and recommendations for the verification process itself. Prospective verifiers should note that special rules apply to become an approved verifier for airports at Levels 4 and 4+.