The EU ETS data viewer provides an easy access to emission trading data contained in the Community Independent Transaction Log (CITL). The CITL is a central transaction log, run by the European Commission, which checks and records all transactions taking place within the trading system. The EU ETS data viewer provides aggregated data by country, by sector and by year on the verified emissions, allowances and surrendered units of the more than 12 000 installations covered by the EU emission trading system.