The Green Mill Index is a tool, developed by Pöyry, for pulp and paper mills. The index represents the relations of different indicators and overall environmental performance of a mill and helps to measure for example energy and water efficiency. Many of the indicators used in Pöyry´s Green Mill Index are based on European Commission standards for best available technology, known as BAT levels."We want to be forerunners concerning environmental sustainability issues. Pöyry's Green Mill Index gave us a complete overview of our production and mill site performance. Although our performance was excellent, there is always room for some improvement, and we know now where to concentrate" a Propapier spokesman said.Progroup AG produces corrugated board formats as its core business. The Propapier PM2 produces corrugated board base papers on the basis of waste paper.