Background: Exposure to ultrafine particles (UFP) in the air can cause adverse effects on human health, particularly affecting respiratory and cardiovascular morbidity and mortality. Conclusions from studies that have examined other health outcomes, such as diabetes, are inconclusive and insufficient regarding the effects of UFP. The aim of this study was to obtain quality data for the planning and formulation of evidence-based public health policies in the area of population health protection in connection with outdoor air pollution with UFP.
Methods: Via an ecological time-trend study based on routinely collected health and environmental data, we assessed the association between the daily number of first curative visits to the Ljubljana Health Center (ZD Ljubljana) for respiratory diseases, circulatory diseases, and diabetes mellitus at the population level in groups of all ages, including children and the elderly. The research was carried out during the period from 01.01.2013 to 31.12.2017. Poisson regression models were used to analyse temporal associations between observed health outcomes, explanatory factors, confounding factors, and background factors.
Results: We could not find a statistically significant positive correlation between the concentration of UFP of all size classes in outdoor air and the daily number of first curative visits to ZD Ljubljana for respiratory diseases, circulatory diseases, and diabetes mellitus in any age groups, except for elevated concentrations of UFP0.05-0.07 (50 to 70 nm; p 䁤 0.001) with a delay of 3 days, which were positively and statistically significantly associated with a higher daily number of first curative visits to ZD Ljubljana due to diabetes mellitus in the group of children. Due to the limitations of the study, further research will be needed to confirm these results. In addition, the research confirmed that exposure to various pollutants in the ambient air (mainly PM2.5, NO2, SO2 and O3) with various time lags has harmful effects on health, which are reflected in a higher daily number of visits at the primary health care level in all investigated age groups.
Conclusion: This study addresses some important challenges in the field of public health, both in the field of research and in the field of environmental and health policy in Slovenia and other countries. The results of this study will serve as a basis for formulating recommendations to environmental and health policy makers in Slovenia regarding the need to adopt an appropriate legal basis for regular routine UFP measurement within the national measurement network for monitoring outdoor air quality in Slovenia (DMKŽ) and regarding the need to publish measurement results, and to inform regarding possible mitigating and adaptive measures, both at the societal and at the individual level.
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