1992 Fiscal Year Final Research Report Summary
Epidemiologic Studies on the Effects of Improvement in Sulfur Oxides Air Pollution
| Project/Area Number |
02670237
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
公衆衛生学
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| Research Institution | (Faculty of Medicine,) Mie University |
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Principal Investigator |
KITABATAKE Masayoshi Mie Univ.,Faculty of Medicine, Lecturer, 医学部, 講師 (00024688)
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| Co-Investigator(Kenkyū-buntansha) |
MURASE Sanako Mie Univ., Faculty of Medicine, Assistant, 医学部, 助手 (20115728)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Sulfur Dioxide / Air Pollution / Health Effect / Epidemiology / Yokkaichi |
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| Research Abstract |
1. Studies on consultation rates and incidences of fresh cases: Using medical bills of National Health insurance up to 1991, studies were made on medical consultation rates and incidences of fresh cases of chronic obstructive lung diseases. Even at present, after more than 10 years since sulfur dioxide level had begun to satisfy the national ambient environmental quality standard in Yokkaichi City, the medical consultation rates in the pollution area were about 2 times higher than those in the control area. The incidences of fresh cases in the pollution area were higher until to 1980 in the cases of bronchial asthma in all age class groups, and in the cases of chronic bronchitis in 40 years old and older until to 1979. Thereafter, the incidences of fresh cases decreased to the level of the control area in both diseases by the improvement of air pollution.
2. Prevalences of respiratory symptoms: Since 1963, studies have been made on prevalences of chronic bronchitis and asthmatic attacks
… More
in all inhabitants of 40 years old and older in the pollution area, using B.M.R.C. questionnaires. In the past, designated area having higher level of pollution showed higher prevalences at the two diseases. Until sulfur dioxide level began to meet the air quality standards, the prevalence of chronic bronchitis had been higher in the polluted area. This value decreased by improvement of pollution. At present, the prevalence decreased to the level in the control area. The prevalence of asthmatic attacks sensitively responded to the improvement of pollution and improved to the same level as in the control area.
3. Mortalities of chronic obstructive lung diseases: Through the period from 1963 to 1992, studies have been carried out on mortalities of chronic obstructive lung diseases. Mortality due to bronchial asthma decreased immediately in response to improvement of pollution, whereas mortality due to chronic bronchitis decreased late to the level in the control area 4 to 5 years after the concentration of sulfur dioxide began to satisfy the ambient air quality standard. Less
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