[Air pollution and the occurrence of recurrent respiratory tract diseases in children in the first years of life. II].

In 200 3-7-year-old children in two localities of Bratislava-city with different concentrations of NO2, SO2, dustiness with different bioclimatic factors and a different epidemiological position the authors investigated their effect on the frequency, incidence and types of relapsing respiratory diseases during different months in 1991. The different concentrations of the above substances in the atmosphere of the two localities did not affect the number of respiratory diseases nor their annual or monthly incidence. In the place with the increased NO2 concentration a significantly higher number of serious forms of respiratory diseases was found in the investigated group. In the locality with a more favourable oecological and epidemiological situation the adverse effect of monthly NO2 concentrations was manifested when it was potentiated by the SO2 concentration and combined with dustiness and dust fall-out. The authors found a significant correlation between the incidence of relapsing respiratory diseases and the atmospheric temperature and its relative humidity in the course of different months of the year.