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cases. To counter this negative effect, strive to have open windows and/or good air exchange throughout your sessions.

Plants have been found to be another simple, yet effective, way to offset some of the pollution that exists in offices and training rooms. In research for the National Aeronautics and Space Administration (NASA), Dr. B. C. Wolverton21 conducted studies using plants to remove pollutants in controlled, closed environments. He and others have found that a number of common house plants successfully remove contaminants. The study concluded that placing plants within an individual's breathing zone (approximately 6-8 cubic feet surrounding the person) improves air quality. It is recommended that two to eight small or two large plants be placed every nine square meters (900 square feet).22

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