The leaf , exposed to the open air, exchanges not only gases with this air but also heat by molecular collisions on its surface.

The carbon dioxide taken up in photosynthesis and released by respiration, the oxygen moving in a opposite direction out of the leaves; water vapor, volatile organic and other materials moving in and out and energy being exchanged in various forms is what is going on inside your office tropical plants.
These gases such as water vapor, oxygen and fragrances are emitted into your offices as a health benefit to you and your staff. PDI currently services Cambridge, MA officescapes.