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. 2011 Jan 26;119(7):1017–1022. doi: 10.1289/ehp.1002913

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(A) Frequency distribution of population-weighted daily mean PM₁₀ concentrations in Flanders (Belgium) during the study period (1998–2006). The arrow indicates the EU limit that may be exceeded up to 35 days/year. (B) Spatial distribution of population-weighted daily mean PM₁₀ concentration, expressed as numbers of days with concentration > 50 μg/m³ (map of Belgium; the Flemish region comprises the area north of the black line, excluding the capital region of Brussels in the center of the country).