Fig. 5From: How effective is ‘greening’ of urban areas in reducing human exposure to ground-level ozone concentrations, UV exposure and the ‘urban heat island effect’? An updated systematic reviewDistribution of study location by Koppen Climate Zone: Some studies were conducted in more than one climate zone. One study conducted across 135 cities is not included here. Six studies conducted completely in climate-controlled conditions are not included in this figureBack to article page