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About this site
This site shows how well each of the 27 EU capitals follows the 3-30-300 rule for urban greenery: three trees in view from every home, 30% tree canopy around it and a park within a 300 m walk. Every capital is measured with the same open data and the same method.
Based on
The 3-30-300 rule comes from Cecil Konijnendijk, who set it out in the paper below, and a European study has assessed 862 European cities against it. This site is based on both, but its method is its own: it looks at each building and each 10 m square, and its city limits and data differ, so its figures can differ from the European study.
- Konijnendijk, C. C. (2023). Evidence-based guidelines for greener, healthier, more resilient neighbourhoods: Introducing the 3–30–300 rule. Journal of Forestry Research 34, 821–830.
- Bertassello, L. E., van der Velde, M., Maes, J., Liu, S., Brandt, M. & Feyen, L. (2026). Assessing European cities with the 3-30-300 rule underscores the need for enhanced urban greening efforts. Nature Communications 17, 4846.
Data credits
- OpenStreetMap and OpenStreetMap land polygons© OpenStreetMap contributors, available under the Open Database License · ODbL 1.0
- Overture Maps buildingsOverture Maps Foundation, and the sources listed on its attribution page · ODbL 1.0
- Meta & WRI High Resolution Canopy Height MapsMeta and WRI 2024, High Resolution Canopy Height Maps; source imagery © 2016 Maxar · CC BY 4.0
- GHS-POP (Global Human Settlement Layer, population)European Commission, Joint Research Centre: GHS-POP R2023A · CC BY 4.0
- WikidataCC0 1.0
- Natural EarthMade with Natural Earth · Public domain