FIGURE 2.

Impact of exposure to air pollutants, noise, and proximity to green areas on gray matter and white matter volume. Colored glass brains in the right column offer a global view of each contribution and act as a legend for color codes: cyan for negative association between NO₂ and GM, magenta for positive association between PM_2.5 and GM, green for positive association between NDVI 300 m and GM, red for positive association between NO₂ and WM, yellow for positive association between PM_2.5 and WM, and blue for positive association between Lden index and WM. Refer to Table 3 for detailed description of the clusters. Cluster colors correspond to glass‐brain legend colors and color code in Table 2 for an easier identification. Positive and negative indicate the sign of the association. GM, gray matter; Lden index, day‐evening‐night sound average; NDVI, normalized difference vegetation index; NO₂, nitrogen dioxide; PM_2.5, fine particulate matter; WM, white matter.