寒冷地の鉄鋼産業都市における大気汚染と呼吸器疾患死亡

15年間の観察

抄録

Effect of air pollution on the mortality for respiratory diseases except tuberculosis and neoplasm was studied in a city located in a cold district with two big iron and steel industries as air pollution sources.
Population studied was the residents of two districts; different with respect to air pollution level and same in the socioeconomic level, and aged 50 years and over.
Mortality rate was calculated for three 5-years periods between 1963 and 1977.
In the first 5-years period, when air polluion was most severe, the mortality rate for respiratory diseases except tuberculosis and neoplasm in the cold season of the high-pollueted district was higher than that in the warm season and that in the cold seaosn of the low-polluted district. Especially in the case of the female, these differences were statistically significant.
The mortality rate for selected respiratory diseases (bronchitis, emphysema and asthma) showed also the same tendency in the first 5-years period.
In the middle and last 5-years period, these high mortality rate, especially of the female, tended to decrease Its causal factors were considered to be mainly the improvement of air pollution and in some part of the change of host factor due to removal of residents susceptible for air pollutants from the polluted area.