Recently published research investigated links between green areas near schools (specifically within 500 meters of them) and student levels of ADHD. Yang and colleagues report that data collected in China about nearly 60,000 children (2 to 17 years old) indicate that “Greenness levels differed substantially across schools and kindergartens. . . . Greater greenness levels were associated with lower odds of ADHD symptoms. . . . Greenness surrounding each child’s school or kindergarten was estimated using 2 satellite image–derived vegetation indexes: the normalized difference vegetation index and the soil-adjusted vegetation index."
Bo-Yi Yang and 16 others. 2019. “Association Between Greenness Surrounding Schools and Kindergartens and Attention-Deficit/Hyperactivity Disorder in Children in China.” JAMA Network Open, vol. 2, no. 12, e1917862, doi: 10.1001/jamanetworkopen.2019.17862