Sample code Sampling site Aerodynamic diameter, μm 210Po 210Pb 210Po/210Pb Residence time, d AP7 Via Machiavelli ≤ 2.5 26.7 ± 1.6 981 ± 42 0.0273 9.89 AP8 Via Machiavelli ≤ 2.5 112 ± 7 1060 ± 45 0.1055 30.1 AP9 Via Machiavelli ≤ 2.5 41.0 ± 2.7 364 ± 15 0.1128 32.0 AP10 Cisi ≤ 2.5 20.3 ± 1.3 467 ± 20 0.0434 14.0 AP11 Cisi ≤ 2.5 13.0 ± 1.5 447 ± 20 0.0291 10.4 AP12 Cisi ≤ 2.5 11.9 ± 0.9 300 ± 13 0.0398 13.1 AP1 Via Machiavelli ≤ 10 29.8 ± 2.0 1089 ± 46 0.0274 9.93 AP2 Via Machiavelli ≤ 10 99.8 ± 6.5 1105 ± 47 0.0903 26.0 AP3 Via Machiavelli ≤ 10 44.9 ± 2.9 360 ± 15 0.1247 35.3 AP4 Cisi ≤ 10 40.0 ± 2.5 486 ± 21 0.0823 24.0 AP5 Cisi ≤ 10 15.4 ± 1.6 523 ± 23 0.0295 10.5 AP6 Cisi ≤ 10 15.5 ± 1.0 333 ± 14 0.0466 14.9 AP13 CSM Roma ≤ 10 13.3 ± 1.1 401 ± 17 0.0331 11.4 Mean ± 1SD Range - - - - 39.2 ± 33.2 11.9-112 626 ± 327 300-1105 0.0632 ± 0.0372 0.0273-0.1247 19.2 ± 9.6 9.89-35.3

Table 6: The 210Po and 210Pb activity concentrations in μBq m-3 in atmospheric particulate samples AP 1-12 collected at Taranto in 11-17 Nov. 2008 and AP 13 at CSM Roma in 19-29 Nov. 2008 and corrected to the sampling time and the calculated residence times.

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