A study at the University of Surrey has been looking at how green and blue spaces can improve air pollution.

The Global Heath Centre for Clean Air Research found parks may be the most effective, cutting air pollution by 22% city-wide.

However, planting trees in narrow streets can worsen air quality as certain trees and arrangements can block airflow, trapping pollution.

Researchers also found that well-placed greenery can cut black carbon levels by up to 40%, making our communities greener and healthier.