Study examines European cities against a 3-30-300 green space standard to improve urban health and climate resilience.
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A study published in Nature Communications by researchers from the Joint Research Centre and the University of Copenhagen examines whether green spaces in 862 European cities meet the “3-30-300 rule,” which suggests residents should be able to see at least three trees, live in an area where tree canopy covers at least 30% of the ground, and have a park within 300 meters. This standard is considered a luxury, with only 2.4% of city dwellers in Spain and 13.5% across Europe meeting it. While 57% of European city residents are near a park (within 300m) and nearly half see at least three trees from home, only about 28% live in areas with 30% canopy cover. The study finds that Northern and Central European cities are generally greener than Southern ones, partly due to climate differences. Only two large European cities, Espoo (Finland) and Varese (Italy), have over half their population meeting the rule. Hungarian cities show strengths in tree visibility (66.1%) and canopy cover (52.4%), but the proximity to a park is weaker at 48.2%. Smaller Hungarian towns like Kaposvár rank well internationally, while Budapest ranks moderately within Hungary and Europe. The text concludes that maintaining continuous, shading canopy cover is crucial for urban heat stress mitigation, and while the rule is currently voluntary in Europe, some cities are implementing specific greening plans to achieve it.
