Duplicate title to Amann, M. ORCID: https://orcid.org/0000-0002-1963-0972, Cofala, J., Gzella, A., Heyes, C. ORCID: https://orcid.org/0000-0001-5254-493X, Klimont, Z. ORCID: https://orcid.org/0000-0003-2630-198X, & Schoepp, W. ORCID: https://orcid.org/0000-0001-5990-423X (2007). Estimating Concentrations of Fine Particulate Matter in Urban Background Air of European Cities. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-07-001