Athens Is Getting Greener — But Slower Than Barcelona and Lisbon

Athens recorded its hottest June since 1987 this year, with temperatures hitting 43 degrees Celsius in the Kifisia basin on June 21. France's catastrophic heatwave, which killed more than 2,000 people at its peak, sent a warning signal across the Mediterranean. Here in the Greek capital, city planners and environmental groups are asking an uncomfortable question: is Athens doing enough, fast enough?

The short answer, according to data compiled by the European Environment Agency through late 2025, is no. Athens ranks near the bottom of a group of 20 comparable southern European cities on green urban space per capita, offering roughly 3.8 square metres of accessible parkland per resident. Lisbon manages 16 square metres. Barcelona, after a decade of its Superblocks programme reclaiming road space for pedestrians and trees, now sits above 14 square metres. Even Thessaloniki, Greece's second city, edges past Athens on that metric.

What Athens Is Actually Doing

That is not to say nothing is moving. The Mitsotakis government's flagship urban greening effort, the Athens Urban Resilience Programme, launched in March 2024 with €47 million drawn from the EU Recovery and Resilience Facility. The initiative targets seven so-called heat islands across the city, concentrating resources on Omonia Square, the Metaxourgeio neighbourhood, and the Kerameikos corridor running toward Piraeus. The plan includes 15,000 new trees planted by December 2026, upgraded shading infrastructure at bus stops, and cool-surface road resurfacing across 38 kilometres of central Athens.

On Pireos Street, where summer asphalt temperatures routinely exceed 55 degrees, the municipality completed the first stretch of reflective paving in April. The Attiko Metro expansion — specifically the 7.6-kilometre southern extension to Piraeus now due to open in late 2027 — is being marketed partly as a climate measure, removing an estimated 24,000 car journeys per day from the ring road. The Athens-Piraeus bus operator OASA added 100 electric buses to its fleet in 2025, though that still leaves roughly 1,100 diesel vehicles in daily service.

Environmental lobby group WWF Hellas, which has offices on Filellinon Street near Syntagma, published a report in May arguing that the Urban Resilience Programme targets are credible but that enforcement of illegal construction in coastal green zones around Glyfada and Vouliagmeni remains lax. The report cited 214 unresolved planning violations in those two suburbs dating back to 2019.

The Tourist Problem Nobody Wants to Name

Tourism complicates everything. Athens expects 6.8 million visitors in 2026, the highest figure on record. Around the Acropolis, in the Plaka and Monastiraki districts, daily foot traffic during July and August routinely surpasses 40,000 people. That density drives up waste volumes, strains water infrastructure, and accelerates surface erosion on protected archaeological grounds. Madrid, which faced a comparable crunch around its historic centre, introduced a visitor cap and a €3 daily environmental levy in selected zones starting in 2023. Rome has begun trialling entrance fees to the Trevi Fountain area. Athens has done neither.

The city's short-term rental explosion — roughly 28,000 Airbnb listings as of May 2026, concentrated in Koukaki, Exarchia, and the Acropolis slopes — has hollowed out residential density in precisely the neighbourhoods where tree-planting and green infrastructure investment would have the most cooling effect. Fewer permanent residents means fewer people to pressure local councils for parks and shade.

What comes next depends on how seriously the central government treats the EU's new Urban Climate Adaptation Framework, which requires member-state capitals to submit updated heat action plans by October 31, 2026. Athens must file that plan. If the Urban Resilience Programme's tree-planting schedule stays on track and the metro extension opens on time, the city will have a credible document to submit. If the Glyfada construction violations remain unresolved and the tourist levy conversation stays off the table, the gap between Athens and Lisbon is unlikely to close before the next heatwave season — and there will be one.