There have been many studies on the relationship between prevalence and incidence of respiratory disease and air pollution. This study was conducted by organized efforts of a regional medical association. Every member of the association reported the numbers of patients with respiratory diseases such as asthmatic bronchitis, chronic bronchitis, and bronchial asthma, and the total number of patients who consulted him/her. The former report was conducted in K city, and this study was of the Y area. These two areas have similar geographical locations and condition of air pollution. The study in K city was conducted between 1973 and 1982, and was between 1981 and 1995 in the Y area. As for air pollution, concentration of SO(x), NO(2), O(x) and SPM surveyed by a national network system was used. The results are as follows : 1. Big differences in the situation of air pollution and correlations between prevalences of respiratory diseases and indicators of air pollution were observed. However, multiple regression analysis of these indicators of prevalence and air pollution showed common evidence in support of the effectiveness of this and other studies.
This means that a monitoring system is useful and informative in evaluating the influence of air pollution on the health conditions of people. 2. NO(2), O(x) and SPM must be paid more attention, because SO(x) was decreased around the end of 1970s among the indicators of air pollution. 3. CB is more attractive in an aging society and in areas that have been more highly air polluted than others.