Plants play an extremely important role in environmental cleanliness by reducing harmful gases in the atmosphere. Spathiphyllum spp. and African violet (Saintpaulia ionantha) plants are widely found in many countries of the world, decorative inside. Since these two plants are commercially propagated throughout the world, they have economic importance at the same time. Spathiphyllum spp. also has a separate prescription due to its ability to clean some air toxins in the interior. Simultaneously monitoring, the frequencies and electrical voltage values per hour were measured by using oscilloscope for during one day on the leaves of these plants. African violet plant decrease and Spathiphyllum spp. increase are showed in frequency values especially at night and in the near morning. The change in voltage values in the Spathiphyllum spp. plant was particularly reduced in the morning and the changes were clearer until the evening, and the voltage change in the African violet plant was at very low levels