Madrid City Council has launched a tender for a 74km-long forest belt to be developed around the city’s perimeters, with hundreds of thousands of new trees that will be planted to help improve the Spanish capital’s poor air quality.
Madrid authorities are looking to develop a huge “environmental belt” made up of between 100,000 and 450,000 trees, new parks and leisure areas and even green bridges over some of the city’s main motorways.
https://www.thelocal.es/20200710/madrid-wants-to-build-biggest-metropolitan-forest-in-europe