January 11th 2014.
A study published in the Journal of Environmental Psychology in 2010 showed that spending even just 20 minutes a day in fresh air boosts vitality that is, having both physical and mental energy.
“Research has shown that people with a greater sense of vitality don’t just have more energy for things they want to do, they are also more resilient to physical illnesses,” said Richard Ryan, professor of psychology at the University of Rochester and an author of the study.

Read more at:

http://www.nj.com/opinion/index.ssf/2014/12/opinion_outdoor_green_can_fight_the_blues.html 

By Michele S. Byers