Fig. 8From: 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 reviewOutcomes measured in each type of green area: Some studies reported outcome data from more than one type of greening area or v.v. and are counted once for each combination. Legend is on a logarithmic scale due to skewed distribution of number of studiesBack to article page