Can plants reduce indoor CO₂ levels?

While plants take in CO₂ (carbon dioxide) during photosynthesis, they continually expel that gas through respiration. This dual process leads to a carbon balance in which fully grown plants manage to balance the intake and output. Individual houseplants have almost no effect on the level of indoor CO₂. Further major reductions in carbon content can only be achieved by installing large areas of greenery, such as living walls consisting of hundreds of plants, in cooperation.

To reduce CO₂ effectively, specialized systems are required. Living walls with rapidly growing species, such as English ivy, are most effective. These systems require strong artificial lighting to enable long periods of photosynthesis. Proper irrigation and fertilisation levels maintain plant health. Air circulation systems distribute the oxygen produced evenly and healthily.

Temperature greatly influences balance. The respiration rate of warmer rooms will increase. Thus, additional CO₂ will be released at night. Cooler rooms under 20° C will slow respiration. A considerate position near the windows allows the full benefits of natural light to be utilized. Avoid an excessive number of plants to prevent mold growth.

For measurable improvements in air quality, methods other than plants should be combined with plants. While mechanical ventilation is more effective for removing CO₂, plants are more effective at removing VOCs, such as formaldehyde. They should be used as supplements to proper HVAC systems. CO₂ levels may be monitored with digital sensors to verify results.

Read the full article: Respiration in Plants: The Complete Process Guide