Key Citations:
1. Bowler DE, Buyung-Ali LM, Knight TM, Pullin AS. (2010) A systematic review of evidence for the added benefits to health of exposure to natural environments. BMC Public Health. 2010 Aug 4;10:456. Available here
2. Grant RH, Heisler GM, Gao W. (2002) Estimation of pedestrian level UV exposure under trees. Photochem Photobiol. 2002 Apr; 75(4):369-76. Available here
3. Nowak, D. (2002). The Effects of Urban Trees on Air Quality. United States Department of Agriculture Forest Service. Available here