Atmos. Chem. Phys. Discuss., 13, 6971-7019, 2013
www.atmos-chem-phys-discuss.net/13/6971/2013/
doi:10.5194/acpd-13-6971-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Variability of carbonaceous aerosols in remote, rural, urban and industrial environments in Spain: implications for air quality policy
X. Querol1, A. Alastuey1, M. Viana1, T. Moreno1, C. Reche1, M.C. Minguillón1, A. Ripoll1, M. Pandolfi1, F. Amato1, A. Karanasiou1, N. Pérez1, J. Pey1, M. Cusack1, R. Vázquez1, F. Plana1, M. Dall'Osto1, J. de la Rosa2, A. de la Campa Sánchez2, R. Fernández-Camacho2, S. Rodríguez3, C. Pío4, L. Alados-Arboledas5, G. Titos5, B. Artíñano6, P. Salvador6, S. Dos Santos García7, and R. Patier Fernández7
1Institute of Environmental Assessment and Water Research, IDAEA, CSIC, Barcelona, Spain
2Associate Unit CSIC – University of Huelva "Atmospheric Pollution", Center for Research in Sustainable Chemistry (CIQSO), University of Huelva, Huelva, Spain
3Centro de Investigación Atmosférica de Izaña (CIAI) de AEMET, Santa Cruz de Tenerife, Spain
4CESAM & Department of Environment, University of Aveiro, Portugal
5Departamento de Física Aplicada, Universidad de Granada, Spain
6CIEMAT, Madrid, Spain
7Instituto de Salud Carlos III, Madrid, Spain

Abstract. We interpret here the variability of levels of carbonaceous aerosols based on a 12-yr database from 78 monitoring stations across Spain especially compiled for this article. Data did not evidence any spatial trends of carbonaceous aerosols across the country. Conversely, results show marked differences in average concentrations from the cleanest, most remote sites (around 1 μg m−3 of non-mineral carbon (nmC), mostly made of organic carbon (OC), with very little elemental carbon (EC) 0.1 μg m−3; OC/EC = 12–15), to the highly polluted major cities (8–10 μg m−3 of nmC; 3–4 μg m−3 of EC; 4–5 μg m−3 of OC; OC/EC = 1–2). Thus, urban (and very specific industrial) pollution was found to markedly increase levels of carbonaceous aerosols in Spain, with much lower impact of biomass burning.

Correlations between yearly averaged OC/EC and EC concentrations adjust very well to a potential equation (OC/EC = 3.37 EC−0.67 R2 = 0.94). A similar equation is obtained when including average concentrations obtained at other European sites (y = 3.61x−0.5, R2 = 0.78).

A clear seasonal variability in OC and EC concentrations was detected. Both OC and EC concentrations were higher during winter at the traffic and urban sites, but OC increased during the warmer months at the rural sites. Hourly equivalent black carbon (EBC) concentrations at urban sites accurately depict road traffic contributions, varying with distance to road, traffic volume and density, mixing layer height and wind speed. Weekday urban rush-hour EBC peaks are mimicked by concentrations of primary gaseous emissions from road traffic, whereas a single midday peak is characteristic of remote and rural sites. Decreasing annual trends for carbonaceous aerosols were observed between 1999 and 2011 at a large number of stations, probably reflecting the impact of the EURO4 and EURO5 standards in reducing the diesel PM emissions. This has resulted in some cases in an increasing trend of NO2/OC+EC ratios, because these standards have been much less effective for the abatement of NOx exhaust emissions in passenger diesel cars. This study concludes that EC, EBC, and especially nmC and OC+EC are very good candidates for new air quality standards since they cover both emission impact and health related issues.


Citation: Querol, X., Alastuey, A., Viana, M., Moreno, T., Reche, C., Minguillón, M.C., Ripoll, A., Pandolfi, M., Amato, F., Karanasiou, A., Pérez, N., Pey, J., Cusack, M., Vázquez, R., Plana, F., Dall'Osto, M., de la Rosa, J., de la Campa Sánchez, A., Fernández-Camacho, R., Rodríguez, S., Pío, C., Alados-Arboledas, L., Titos, G., Artíñano, B., Salvador, P., Dos Santos García, S., and Patier Fernández, R.: Variability of carbonaceous aerosols in remote, rural, urban and industrial environments in Spain: implications for air quality policy, Atmos. Chem. Phys. Discuss., 13, 6971-7019, doi:10.5194/acpd-13-6971-2013, 2013.
 
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