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1This paper provides an estimation of air emissions (CO 2 , NO X , SO X and PM) released 2 by cruise vessels at the port-level. The methodology is based on the "full bottom-up" 3 approach and starts by evaluating the fuel consumed by each vessel on the basis of its 4 individual port-activities (manoeuvring, berthing and hoteling). The Port of Barcelona 5 was selected as the site at which to perform the analysis, in which 125 calls of 30 6 cruise vessels were monitored. Real-time data from the Automatic Identification 7 System (AIS), factor emissions from engine certificates and vessel characteristics from 8 IHS-Sea web database were also collected for the analysis. The research findings 9show that the most appropriate indicators are inventory emissions per "port time-Gross 10 Tonnage", "port time-passenger" and "port-time". These emission indicators improve 11 our understanding of cruise emissions and will facilitate the work that aims to estimate 12 reliably and quickly the in-port ship emission inventories of cruise ports. 13 14

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