Fig. 1From: Associations of greenness, greyness and air pollution exposure with children’s health: a cross-sectional study in Southern ItalyNDVI index of geo-coded children for April 16, 2013, obtained from ASTER optical images. Values greater than 0.5 indicate healthy vegetation. Blue points indicate the residence of each child; colors from red (low exposure) to green (high exposure) indicate the intensity of NDVIBack to article page