On 16th January 2013 GSA partners met at Schiphol Airport Amsterdam to discuss project progress on the topic of CO2 monitoring at Small and Medium Airports (SMAs). Following a detailed and very informative presentation, by Susannah Fitzherbert-Brockholes of the WSP Group, on the ACI Air Carbon Accredition Scheme the participants discussed the various aspects of accrediton for smaller airports. Representatives from Groningen Airport Eelde, Billund Airport and Bremen Airport each presented their approaches and experiences to date in terms of CO2 Monitoring. Status, methodologies for compliance, challenges and outlook were discussed in depth. CO2 monitoring is regarded as a substantial element in the overall sustainability strategy. The GSA project aims to provide a toolkit dealing with this subject.