If you live in a polluted city, spend most of your time indoors, have no plants at home or live in a northern climate, then chances are that you are not getting adequate amounts of sunlight exposure and fresh air as you should.
Sunlight and the exposure to the sun are essential to our health, as well as to your emotional and mental well being. Similar to diet, proper nutrition, exercise and sleep, a controlled and moderate daily exposure to the sun and to adequate amounts of fresh air are two important foundations of good health.