The 2024 ‘State of the Air’ report published by the American Lung Association has revealed that 39% of Americans—131.2 million people—still live in places with unhealthy levels of ozone or PM2.5. 11.7 million more than in last year’s report.

The UK’s undershoot on heat pumps underlines the challenge of decarbonising the built world. Catriona Hyland, research analyst at A/O, presents six priorities we need to tackle urgently.