Association of air pollution and green space with all-cause general practitioner and emergency room visits: A cross-sectional study of young people and adults living in Belgium.

Background: Residing in areas with lower levels of air pollution and higher green space is beneficial to physical and mental health. We investigated associations of PM, tree cover and grass cover with in-hours and out-of-hours GP visits and ER visits, for young people and adults. We estimated potential cost savings of GP visits attributable to high PM.