What went right this week: big cities breathed a little easier, plus more

Air quality has improved dramatically in some of the world’s biggest cities, a report has found, with Beijing (main picture), London and Paris among those leading the way. 

The research, conducted by campaign group Breathe Cities, identified 19 metropolises that have slashed air pollution by between 20% and 40% in just 15 years. Nearly half were in Asia, where improvements came despite rapid economic development. Nine were in China. 

An embrace of cycling, the introduction of clean air zones and a switch to electric vehicles were among the leading drivers of air quality improvements, the report found. However, there’s much work to be done. Separate research shows that only 14% of cities globally met the World Health Organization’s pollution guidelines in 2025.  

Air pollution is the world’s leading environmental health risk, driving respiratory and cardiovascular disease, asthma, and premature births, with lower-income communities most affected. However, it doesn’t have to be this way. 

“The pathway to cleaner air has been tested at scale – now it’s about enabling more cities to follow it,” said Cecilia Vaca Jones, Breathe Cities’ executive director.

The cities identified in the report are: Brussels (Belgium); Beijing, Chengdu, Hangzhou, Hong Kong, Nanjing, Qingdao, Shenzhen, Wuhan and Zhenjiang (China); Paris (France); Berlin and Heidelberg (Germany); Rome (Italy); Amsterdam and Rotterdam (Netherlands); Warsaw (Poland); London (England); and San Francisco (US).

Related: 10 ways that future urban living will be greener

Image: Kristi Blokhin