2024 No Inverse relationship between urban green space and childhood autism in California elementary school districts http://dx.doi.org/10.1016/j.envint.2017.07.010 Wu, Jianyong North America Epidemiological Students Elementary (K-5) Green space Other autism spectrum disorder Greenness Near-road tree canopy Air pollution School children District-level study in California linked autism prevalence to various green space metrics; found tree canopy and grassland near roads inversely associated with autism rates. 2017