This video presents in 2 minutes the advantages of implementing the recommendations included in the Environmental Monitoring report elaborated in the frame of EROCIPS and ARCOPOL projects. This document proposes a monitoring programme in the north-west Atlantic coast of Portugal for the establishment of environmental baseline reference data sets based on developed environmental baselining protocols (i.e. protocols for selection of monitoring areas and sites and selection of sentinel species, and advice on selecting the type of monitoring and seasonality), to be used as a reference for pre-incident conditions. It reports the monitoring programme from its rationale and conception to the discussion of the achieved results, and it is divided into two main components: a monitoring programme in coastal areas and a monitoring programme in estuarine systems.