During the 2–time periods 00:00–05:00 h and 14:00–18:00 h approximately, the median BC concentration exhibits lower levels and varies between 1.3–2.1 μg m–3 in DS1 and 1.4–1.9 μg m–3 in RS, at Centro (Figure 3a) while it varies between 1.5–3.6 μg m–3 in DS1 and 1.9–2.4 μg m–3 in RS, at Miravalle (Figure 3b).