Airport Carbon Accreditation Program - Level 3

King County International Airport-Boeing Field is committed to achieving carbon neutral status by 2030 in accordance with the county's Strategic Climate Action Plan.

The Airport Carbon Accreditation Program (ACAP) is an internationally recognized carbon management program with more than 600 participating airports. With seven levels of accreditation, ACAP provides participating airports a systematic path towards achieving their carbon reduction goals.

KCIA achieved ACAP Level 3 in late 2025. To gain this status, KCIA was required to create a fuller picture of its carbon footprint by including emissions from other sources, such as flights, aircraft ground movements, vendor vehicles, and more. The airport engaged users and tenants to collect information about their greenhouse gas emissions, with the goal of seeking ways to reduce them.

To assist in the ACAP effort, KCIA is working with WSP, a globally recognized professional services firm providing strategic advisory, engineering, and design services to clients in multiple sectors, including transportation, infrastructure, and the environment. The airport is also utilizing the services of PRR, a locally-owned firm that specializes in community engagement on transportation and environmental issues.

For more information about this effort, email KCIACommunityOutreach@kingcounty.gov.