Lahti is a city in Finland and the regional capital of Päijät-Häme. It is located in the Finnish Lakeland. The population of Lahti is approximately 121,000, while the sub-region has a population of approximately 204,000. It is the 9th most populous municipality in Finland, and the sixth most populous urban area in the country.

The European Green Capital Award (EGCA) is an award given by the European Commission each year to a European city based on its environmental record. The award was launched on 22 May 2008, with the first award being given to Stockholm for the year 2010. The European Commission has long recognised the important role that local authorities play in improving the environment, and their high level of commitment to genuine progress. The European Green Capital Award has been conceived as an initiative to promote and reward these efforts.