1. Context and definition of the concept
- About 55% of the world population lives in cities, consuming 64% of primary energy and generating 70% of CO2 emissions. This population is very much exposed to local pollution, as it is in cities that the highest concentration of pollutants is produced.
- Almost 7 million people meet early deaths every year because of air pollution worldwide: over 500,000 in Europe and over 33,000 in Spain.