AOT has been operating 6 airports in Thailand.
Five of them are awarded the ISO 14064-1. Leading by Sunvanabhumi International Airport that has been maintain the GHG inventory report since 2011 and also has recently been ACA level 2 certified (i.e., the "Reduction" step of ACA requires carbon management and progress towards a reduced carbon footprint),
the other four airports - - Chiang Mai International Airport, Mae Fah Luang Chiang Rai International Airport, Don Muang International Airport, and Hat Yai International Airport - - are awarded and certified ISO 14064-1 and LCA level 1 (i.e., the "Mapping" step of ACA requires carbon footprint measurement)