More than a decade after China launched an aggressive campaign to reduce air pollution, the country’s air quality has reached its best on record, with the cleanup generating huge health benefits.

Medellín in Colombia was experiencing a severe urban heat island effect. Now, new green growth is bringing temperatures down dramatically.

As restrictions on petrol-driven leaf-blowers spread across the US, neighbourhoods are getting quieter — and cleaner.

Engineers have found that almost any material can be turned into a device that continuously harvests electricity from humidity in the air.

Low-emission zones in big cities such as London reduce air pollution, especially for poorer communities.