Volcanic sulfur dioxide and acute respiratory symptoms on Miyakejima island

A. Ishigami, Y. Kikuchi, S. Iwasawa, Y. Nishiwaki, Toru Takebayashi, S. Tanaka, K. Omae

Research output: Contribution to journalArticle

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Abstract

Objectives: Following a volcanic eruption in 2000, high concentrations of ambient sulfur dioxide (SO2) are still observed on Miyakejima, Japan despite the reversal 2 years ago of the ban on residents living on the island. This study examines the association between current levels of volcanic SO 2 and the incidence of acute subjective symptoms in volunteers on Miyakejima. Methods: The authors conducted a follow-up study on 611 healthy volunteers, on a person-hour basis (28 413 person-hours), who visited the island to provide support to residents from February to July 2005. Adverse health symptoms were measured by self-administered diary and exposure was approximated using monitoring data across 14 sites. Associations between incidence rates and increasing SO2 levels (reference (the lowest), very low, low, middle and high) were examined using Poisson regression. Results: Hourly incidence of cough, scratchy throat, sore throat and breathlessness showed clear exposureresponse relationships with SO2 concentrations. There were statistically significant risks of those symptoms at relatively low SO 2 levels. Thus, rate ratios in the 0.6-2.0 ppm exposure band (vs <0.01 ppm) were: for cough, 3.4 (95% Cl 1.8 to 6.6) in men and 9.8 (3.9 to 24.9) in women; for sore throat, 3.2 (1.7 to 6.2) in men and 5.8 (2.0 to 16.5) in women; and for breathlessness, 10.5 (4.2 to 26.6) in men and 18.5 (4.6 to 74.3) in women. Little evidence of SO2 effects on sputum and nasal discharge/congestion was observed in this study. Eye and skin irritations showed inconsistent results between hourly maximal and hourly mean SO2 concentrations. Conclusion: The authors observed strong evidence of an exposure-response relationship between volcanic SO2 and subjective acute respiratory symptoms among a healthy population on Miyakejima. The results are consistent with reports that females and non-smokers are more sensitive to irritant gas than males and smokers, respectively.

Original languageEnglish
Pages (from-to)701-707
Number of pages7
JournalOccupational and Environmental Medicine
Volume65
Issue number10
DOIs
Publication statusPublished - 2008 Oct

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Sulfur Dioxide
Islands
Pharyngitis
Cough
Dyspnea
Incidence
Volcanic Eruptions
Irritants
Pharynx
Sputum
Nose
Volunteers
Healthy Volunteers
Japan
Gases
Skin
Health
Population

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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Volcanic sulfur dioxide and acute respiratory symptoms on Miyakejima island. / Ishigami, A.; Kikuchi, Y.; Iwasawa, S.; Nishiwaki, Y.; Takebayashi, Toru; Tanaka, S.; Omae, K.

In: Occupational and Environmental Medicine, Vol. 65, No. 10, 10.2008, p. 701-707.

Research output: Contribution to journalArticle

Ishigami, A, Kikuchi, Y, Iwasawa, S, Nishiwaki, Y, Takebayashi, T, Tanaka, S & Omae, K 2008, 'Volcanic sulfur dioxide and acute respiratory symptoms on Miyakejima island', Occupational and Environmental Medicine, vol. 65, no. 10, pp. 701-707. https://doi.org/10.1136/oem.2007.033456
Ishigami, A. ; Kikuchi, Y. ; Iwasawa, S. ; Nishiwaki, Y. ; Takebayashi, Toru ; Tanaka, S. ; Omae, K. / Volcanic sulfur dioxide and acute respiratory symptoms on Miyakejima island. In: Occupational and Environmental Medicine. 2008 ; Vol. 65, No. 10. pp. 701-707.
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