My profession is caring for plants in office environments, so I appreciate all that has been written in that article as well as ongoing research that continues to establish the many benefits that plants provide.
I had almost the opposite experience from Laurie's. After 9/11 in NYC, many local schools were closed for 1-3 months due to air quality issues. When they re-opened, we brought in dozens of large plants donated by FL nursery growers to the classrooms to help clean the air and lift the spirits of students and staff.