# European TreeTag campaign implementation > Live situation record from CLSTR: https://clstr.news/situations/european-treetag-campaign-implementation > Updated: 2026-09-18T17:29:00.000Z. Sources: 4. Developments: 2. The European TreeTag'26 campaign is being implemented across various European regions to highlight the environmental benefits of urban trees, such as carbon storage, oxygen production, and biodiversity support. In Portugal, municipalities including Ponta Delgada and Vialonga have participated. In Ponta Delgada, an informative plaque was placed on a Metrosideros excelsa tree to detail its specific contributions to oxygen production and water retention. In Vialonga, ten trees were tagged to engage the community in learning about climate resilience. The Portuguese efforts are coordinated by the Centro de Ecologia Aplicada ‘Professor Baeta Neves’. In Denmark, the campaign has recognized notable trees in Svaneke and Odsherred Municipality. In Svaneke, a roadside poplar was designated as an ‘evighedstræ’ (eternity tree) by the Danish Society for Nature Conservation Bornholm. These initiatives aim to foster public connection to large trees and emphasize their role in purifying air and providing shade. ## Timeline ### 2026-09-18: Danish trees recognized in European TreeTag campaign Trees in Svaneke and Asnæs have been recognized through the European TreeTag campaign to highlight the environmental and community benefits of urban greenery. 2 sources. https://clstr.news/cluster/danish-trees-recognized-in-european-treetag-campaign ### 2026-09-17: TreeTag campaign launches in Ponta Delgada and Vialonga Portuguese cities Ponta Delgada and Vialonga have joined the European TreeTag'26 campaign, using informative tags on urban trees to highlight their roles in oxygen production and carbon storage. 2 sources. https://clstr.news/cluster/treetag-campaign-launches-in-ponta-delgada-and-vialonga --- Cite as: European TreeTag campaign implementation. CLSTR, https://clstr.news/situations/european-treetag-campaign-implementation