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According to the effects of small pot plants, a few indoor plants, blockages of electromagnetic waves, and plant simulated objectives on the protection against harmful electromagnetic waves (ELF: extremely low frequency and VLF: very low frequency) radiated from computer monitor, it was shown that all treatments did not have any effect on the reduction of magnetic waves in both ELF and VLF. In the case of electric waves, however, there were a little reduction by small potted plants, but the measured values did not reach below values ruled by TCO (Tjatemannes Central Organization, Swedish Confederation of Professional Employees; electric field: 10 V/m an 1 V/m in ELF and VLF, respectively) as same as that of blockages of electromagnetic waves. However, when indoor plants with about 1 m in height were placed nearby monitor and electric cable from screen filter set in monitor was connected into pot soil instead of other parts of plant, the protective effect against electric waves of ELF and VLF bands was by far better than that of screen filter alone or inorganic simulated objectives with the same size and, furthermore, their values were below the values ruled by TCO.
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