London has been recognised for:
Clean air: London’s ULEZ has helped cut nitrogen dioxide concentrations in central London by an estimated 54%, improving air quality for more than 9 million residents.
Cutting emissions: Carrying 800M+ passengers and sparking 71,000+ new homes, the Elizabeth Line shows how linking transit and housing cuts car dependence to drive sustainable urban growth.
Regenerating neighbourhoods: From King’s Cross to Queen Elizabeth Olympic Park, London has transformed former industrial and underused areas into thriving neighbourhoods.
⭐️London wins major climate award ⭐️
London has won the Lee Kuan Yew World City Prize – one of the world’s most prestigious honours for urban planning and city development.
@mayoroflondon.bsky.social
C40 Cities
C40 Cities
Wanted:
✅ More housing
✅ Less sprawl
✅ Lower emissions
From compact neighbourhoods to building retrofits, city leaders are advocating for climate-smart housing solutions and how they can help create more liveable, sustainable cities.
#WCS2026
C40 Cities
We asked mayors: what’s one item that best represents your idea of a liveable, resilient, and sustainable city?
Their answers show how climate action delivers cleaner air, stronger communities, and a better quality of life.
What item would you choose?
#CleanAirDay
#WCS2026
“Retrofitting buildings is not just a climate tool. Its impacts cascade across every dimension of life, climate, of course, but also financial, comfort, and dignity,” said @annehidalgo.bsky.social, former C40 Chair and now the Global Ambassador for Global Covenant of Mayors for Climate & Energy.
"This prize is a tribute to our innovative work over the last ten years. Ours is a city of openness, opportunity, and progress – and together we will continue to build a safer, fairer, greener and more prosperous London for everyone." - C40 Co-Chair & @london.gov.uk @sadiqkhanlondon.bsky.social
