Fig. 14From: 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 reviewForest plot for effect of forests/woodlands on air temperature. The Y-axis shows study first author and date. The X-axis shows the difference in AT between treed and non-treed sites. Some studies are associated with more than one effect size if the data were presented for different seasons or times of day. For full citation and meta-data for each study see Additional files 1 and 2 for details of data sourcesBack to article page