At least 30 cities around the world are currently working to create “clean air zones,” according to a tally by C40, a global network of mayors focused on climate action.
The cities — including Bogotá, London, Paris, Quito, Seattle and Stockholm — are paving the way towards a future “where every city enjoys the benefits of clean air,” C40 said in a statement, adding that clean air zones are “one of the most powerful transport policies” that rapidly slash emissions and deliver other benefits.
A clean air zone is a designated area in a city with measures in place to cut toxic pollution from vehicles, promote active travel modes such as walking, cycling and public transport, and prioritise people over cars.
These policies can be difficult to implement and often face resistance from politicians and communities. Yet, when designed well, they’ve proven to be “transformative and successful,” C40 says.
The recent expansion of London’s clean air zone – now the world’s largest – has led to a 13% reduction in nitric oxide (NOx) emissions from cars and a 7% reduction from vans, along with a 22% decrease in fine particulate pollutants (PM2.5) from cars, according to the organisation.
A recent study that analysed six years of data found that the creation of low-traffic neighbourhoods in London – a type of clean air zone – had delivered health economic benefits that exceeded the costs involved by 100 times.
Anne Hidalgo, the mayor of Paris, said in the C40 statement: “Paris’ collaboration with C40 mayors ahead of the Olympics demonstrated how cities can pass the baton to each other, join forces to combat the climate crisis and celebrate open, healthier, more liveable streets for everyone.”
A recent survey by C40 suggested strong support for these programmes in Bogotá, Johannesburg, London, Quito, Seattle, Seoul, Stockholm, and Warsaw.
More than 80% of respondents want their leaders to prioritise clean air, and more than 90% support expanding public transport and active mobility, C40 says. Meanwhile, 88% are in favour of creating or expanding clean air zones, with approval rates of 97% in Johannesburg and 96% in Quito.
C40 recently produced a clean air toolbox to help cities design and implement clean air zones, engage with residents, and gain public and political support along the way.
