Laboratory studies, including the NASA Clean Air Study, demonstrate that plants can remove certain airborne pollutants such as volatile organic compounds (VOCs) through leaf absorption and microbial activity in the soil. However, these experiments were conducted in sealed environments that do not reflect typical office conditions.
According to the study by NASA, common office plants such as the snake plant, spider plant, and many more were revealed to be highly efficient in removing pollutants such as formaldehyde, benzene, and trichloroethylene from the air. These pollutants in the indoor air are commonly found in commercial office buildings, and it is well-recognised that they have a negative influence on human health. They are known to cause symptoms such as headaches, dizziness, and problems with our respiratory systems. Although, one plant for every one hundred square feet of area is required, in accordance with the conclusions of the study, to detect a measurable improvement in the air quality inside an office setting.
In modern workplaces, ventilation systems and air exchange rates play a far more significant role in determining indoor air quality. Research published in peer reviewed journals, including analyses in nature, show that the rate at which plants remove pollutants is extremely low compared to mechanical ventilation. To achieve a measurable reduction in pollutants equivalent to standard air filtration systems, an impractically large number of plants - potentially hundreds per room - would be required.
Field studies conducted in real office environments reinforce this conclusion. While some reductions in pollutants such as carbon dioxide and VOCs have been observed, these changes are generally small and not sufficient to meaningfully improve air quality. However, the presence of indoor plants consistently contributes to improved employee wellbeing. Workers report enhanced mood, reduced stress, and a greater sense of comfort, which can positively influence productivity and job satisfaction.
The process of photosynthesis is one of the primary ways in which plants contribute to the preservation of a healthy atmosphere by regulating the proportions of various gases. Plants convert the light energy they get from the sun into the chemical energy they need to grow and maintain their lives. During this process, plants absorb carbon dioxide (CO2) from the air and expel oxygen (O2) as a byproduct. This procedure is not only necessary for the continued existence of plants, but it can also contribute to the improvement of air quality at work, or as employees would say, "make the air less stuffy."
There is a ‘correlation’ between having plants in the workplace and improved air quality, which leads to a range of health benefits for those working there. For example, research that was carried out by the University of Exeter found that office workers who had plants in their work environment reported experiencing 15% less symptoms of sick building syndrome. Headaches, dry skin, and a general sense of exhaustion are among these symptoms.
Yes, plants do clean indoor air in the workplace, but their real-world effectiveness is often overstated and depends heavily on having a very large volume of plants. While plants do absorb volatile organic compounds (VOCs) and increase humidity, scientific consensus suggests they cannot replace mechanical ventilation systems in commercial offices.
It was discovered that participants had a calming effect from the presence of indoor plants, which also enhanced their capacity to focus on tasks at hand. The outcomes of the study indicated that individuals who were in a setting that had office plants had a rate of creative output that was thirteen percent higher and a rate of productive output that was fifteen percent higher. An internal study by Oxygen at Work, in which over 300 employees of their customers were surveyed, confirms this perception. Given this, the possibility that the presence of indoor plants in the office may contribute to enhanced mental and physical health.
Despite the nuanced reality of their air purification capabilities, indoor plants offer numerous other benefits. they can increase humidity through transpiration, which can be particularly helpful during dry winter months. They contribute to a more relaxing and aesthetically pleasing environment, which can reduce stress and improve mood. Studies have also shown that plants can improve cognitive function and concentration. Therefore, while relying solely on plants for comprehensive air purification may be unrealistic, their presence undeniably enhances the indoor environment in various ways.
Overall, indoor plants should not be relied upon as a primary method for air purification in the workplace. Instead, they are best viewed as a complementary feature that enhances the indoor environment psychologically and aesthetically. Effective air quality management should prioritise proper ventilation, source control of pollutants, and mechanical filtration systems, with plants serving as an additional, but with a limited benefit.