This project provides important input into the Commission report to the European Parliament and Council on the implementation of the National Emissions Ceilings (NEC) Directive (2016/2284/EU), which is due by 1 April 2020. Under the NEC Directive, Member States are required to provide the Commission and EEA with data on the negative impacts of air pollution upon ecosystems, which they collect from a network of monitoring sites representative of their different habitats and forest ecosystem types. This project analyses the submitted data – including on completeness and quality –and assesses how the ecosystem monitoring and reporting process could be improved for future reporting rounds.