Sample code Sampling site Aerodynamic diameter, μm 210Po 210Pb 210Po/210Pb Residence time, d AP14 Alto Adige ≤ 2.5 122 ± 9 727 ± 31 0.168 47.9 AP15 Alto Adige ≤ 2.5 106 ± 8 683 ± 30 0.155 44.1 AP16 Via Machiavelli ≤ 2.5 109 ± 8 627 ± 28 0.174 49.7 AP17 Via Machiavelli ≤ 2.5 34.2 ± 2.8 659 ± 29 0.0519 16.2 AP18 Via delle Sorgenti, Statte ≤ 10 72.8 ± 5.6 644 ± 28 0.113 32.1 AP19 Via delle Sorgenti, Statte ≤ 10 37.1 ± 3.3 736 ± 32 0.0504 15.8 AP20 Via delle Sorgenti, Statte ≤ 10 102 ± 8 982 ± 42 0.104 29.7 Mean ± 1SD Range - - - - 83.4 ± 35.8 34.2-122 722 ± 121 627-982 0.117 ± 0.052 0.0504-0.174 33.6 ± 14.2 15.8-49.7

Table 7: The 210Po and 210Pb activity concentrations in μBq m-3 in atmospheric particulate samples collected at Taranto in 4-9 May 2009 and corrected to the sampling time and the calculated residence times.

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