Effects of various indoor environmental factors on the decay of chlorine dioxide gas concentration: Implication on its use against pandemic flu

Hitomi Tsutsumi, Fumihiko Shinoda, Shin Ichi Tanabe, Hitomi Takeuchi, Nobuhiro Hirasuga, Motohiko Iwase, Masakazu Setsujima, Kouichi Nakahara

Research output: Contribution to journalConference article


Pandemic flu is now a big concern all round the world. Prevention of the influenza virus using Air cleaning systems is very effective. Recently, air cleaning systems with the chlorine dioxide (ClO2) gas have been developed. The ClO2 gas is easily decomposed by indoor climate factors such as lighting, thermal environment, organic matter, and sound. Two types of experiments were conducted to evaluate the effects of indoor environmental factors on the decrease in the ClO2 gas concentration and to calculate its reaction (decay) rate constant. The first experiment was conducted in an office room. Ten types of environmental conditions were examined. The ClO2 gas concentration at the centre of the room was kept below a permissible exposure level to human beings throughout the 120-min experiment. High-humidity environment and illuminance had a significant impact on the decrease in the ClO2 gas concentration. The second experiment was conducted in a thermostatic chamber using a Tedlar bag to measure the decrease in the ClO2 concentration in detail and to calculate the reaction rate constant. The concentration of the ClO2 gas in the Tedlar bag was measured every 1h for 6 h. Ten types of environmental conditions were examined. It was found that a high air temperature and light irradiation accelerated the decrease in the ClO2 gas concentration; the latter had a more significant effect on the decrease in t he ClO2 gas concentration. The results obtained from our exp eriments will be useful in using t he Cl O2 gas against pandemic flu.

Original languageEnglish
JournalIAQ Conference
Publication statusPublished - 2011 Dec 1
EventAirborne Infection Control - Ventilation, IAQ, and Energy Conference, IAQ 2010 - Kuala Lumpur, Malaysia
Duration: 2010 Nov 102010 Nov 12


ASJC Scopus subject areas

  • Building and Construction
  • Environmental Engineering
  • Public Health, Environmental and Occupational Health

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