Ultrafine particles (UFP) are the smallest constituents of airborne particulate matter: they are smaller than 0.1 micrometres and invisible to our eyes. UFP can be inhaled more deeply into the lungs than larger particles, and are likely to have adverse health effects. However, they are not routinely monitored, and up to now there is not enough conclusive evidence on health impacts of UFP.

The project UFIREG (Ultrafine Particles - an evidence based contribution to the development of regional and European environmental and health policy) aimed to improve the knowledge base on possible health effects of UFP and to raise overall awareness of environmental and health care authorities and citizens. The project started in July 2011 and lasted until December 2014. It was implemented through the CENTRAL EUROPE Programme, co-financed by the European Regional Development Fund (ERDF).

The UFIREG partner consortiums brought together a group of seven institutions from four European countries (Czech Republic, Germany, Slovenia, Ukraine), who are experts in the fields of air pollution, epidemiology and public health. UFIREG partners established harmonised and quality-assured measurements of UFP in five cities in the Czech Republic (Prague), Germany (Augsburg, Dresden), Slovenia (Ljubljana) and Ukraine (Chernivtsi). They assessed exposure to UFP and other air pollutants and investigated short-term effects of UFP on daily counts of hospital admissions and natural deaths, especially in relation to cardiovascular and respiratory diseases.

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