Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 3673-3685, 2017
http://www.atmos-chem-phys.net/17/3673/2017/
doi:10.5194/acp-17-3673-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Mar 2017
AIRUSE-LIFE +: estimation of natural source contributions to urban ambient air PM10 and PM2. 5 concentrations in southern Europe – implications to compliance with limit values
Evangelia Diapouli1, Manousos I. Manousakas1, Stergios Vratolis1, Vasiliki Vasilatou1, Stella Pateraki1, Kyriaki A. Bairachtari1, Xavier Querol2, Fulvio Amato2, Andrés Alastuey2, Angeliki A. Karanasiou2, Franco Lucarelli3, Silvia Nava3, Giulia Calzolai3, Vorne L. Gianelle4, Cristina Colombi4, Célia Alves5, Danilo Custódio5, Casimiro Pio5, Christos Spyrou6, George B. Kallos6, and Konstantinos Eleftheriadis1 1Institute of Nuclear & Radiological Science & Technology, Energy & Safety, N.C.S.R. “Demokritos”, Athens, 15341, Greece
2Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, 08034, Spain
3Department of Physics and Astronomy, Università di Firenze and INFN-Firenze, Sesto Fiorentino, 50019, Italy
4Environmental Monitoring Sector, Arpa Lombardia, Milan, 20124, Italy
5Centre for Environmental & Marine Studies, Department of Environment, University of Aveiro, Aveiro, 3810-193, Portugal
6School of Physics, University of Athens, Athens, 15784, Greece
Abstract. The contribution of natural sources to ambient air particulate matter (PM) concentrations is often not considered; however, it may be significant for certain areas and during specific periods of the year. In the framework of the AIRUSE-LIFE+ project, state-of-the-art methods have been employed for assessing the contribution of major natural sources (African dust, sea salt and forest fires) to PM concentrations, in southern European urban areas. 24 h measurements of PM10 and PM2. 5 mass and chemical composition were performed over the course of a year in five cities: Porto, Barcelona, Milan, Florence and Athens. Net African dust and sea-salt concentrations were calculated based on the methodologies proposed by the EC (SEC 2011/208). The contribution of uncontrolled forest fires was calculated through receptor modelling. Sensitivity analysis with respect to the calculation of African dust was also performed, in order to identify major parameters affecting the estimated net dust concentrations. African dust contribution to PM concentrations was more pronounced in the eastern Mediterranean, with the mean annual relative contribution to PM10 decreasing from 21 % in Athens, to 5 % in Florence, and around 2 % in Milan, Barcelona and Porto. The respective contribution to PM2. 5 was calculated equal to 14 % in Athens and from 1.3 to 2.4 % in all other cities. High seasonal variability of contributions was observed, with dust transport events occurring at different periods in the western and eastern Mediterranean basin. Sea salt was mostly related to the coarse mode and also exhibited significant seasonal variability. Sea-salt concentrations were highest in Porto, with average relative contributions equal to 12.3 % for PM10. Contributions from uncontrolled forest fires were quantified only for Porto and were low on an annual basis (1.4 and 1.9 % to PM10 and PM2. 5, respectively); nevertheless, contributions were greatly increased during events, reaching 20 and 22 % of 24 h PM10 and PM2. 5 concentrations, respectively.

Citation: Diapouli, E., Manousakas, M. I., Vratolis, S., Vasilatou, V., Pateraki, S., Bairachtari, K. A., Querol, X., Amato, F., Alastuey, A., Karanasiou, A. A., Lucarelli, F., Nava, S., Calzolai, G., Gianelle, V. L., Colombi, C., Alves, C., Custódio, D., Pio, C., Spyrou, C., Kallos, G. B., and Eleftheriadis, K.: AIRUSE-LIFE +: estimation of natural source contributions to urban ambient air PM10 and PM2. 5 concentrations in southern Europe – implications to compliance with limit values, Atmos. Chem. Phys., 17, 3673-3685, doi:10.5194/acp-17-3673-2017, 2017.
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Short summary
This study examined the contribution of two natural sources (long-range transport of African dust and sea salt) to the airborne particulate matter concentrations, in 5 southern European cities (Porto, Barcelona, Milan, Florence, Athens). The results demonstrated that natural sources are often expressed with high-intensity events, leading even to exceedances of the EU air quality standards. This effect was more pronounced in the case of African dust intrusions in the eastern Mediterranean area.
This study examined the contribution of two natural sources (long-range transport of African...
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