Number Size Distribution of Ambient Particles in a Typical Urban Site: The First Polish Assessment Based on Long-Term (9 Months) Measurements
Table 2
Descriptive statistics for sets of 24-hour (24 h) number concentrations of PM in Zabrze.
Impactor stagea
Period
Number of 24 h concentrationc
Time coverage
Min. (1/cm3)
Max. (1/cm3)
Arithmetic mean (1/cm3)
Standard deviation (1/cm3)
25th percentile (1/cm3)
Median (1/cm3)
75th percentile (1/cm3)
0.028
MPb
280
75
189.46
4543.99
1340.15
858.22
671.21
1097.38
1788.22
Sb
183
77.6
189.46
3850.79
1274.52
792.78
636.67
1042.03
1760
Wb
97
70.1
190.91
4543.99
1477.2
966.62
811.82
1271.66
1856.99
0.056
MPb
280
75
226.8
5367.99
1351.73
878.88
758.41
1086.64
1761.2
Sb
183
77.6
232.67
3255.41
1173.78
622.52
704.25
1010.49
1539.38
Wb
97
70.1
226.8
5367.99
1723.32
1171.32
920.49
1352.37
2135.21
0.095
MPb
280
75
161.87
6895.54
1066.5
874.03
571.08
850.56
1248.42
Sb
183
77.6
161.87
2265.24
832.06
425.27
491.44
740.19
1035.76
Wb
97
70.1
325.96
6895.54
1556.07
1275.57
775.15
1145.23
1937.02
0.157
MPb
280
75
158.58
5903.64
1019.66
775.49
559.98
822.47
1191.85
Sb
183
77.6
158.58
2004.65
791.1
371.09
518.55
734.06
995.12
Wb
97
70.1
208.16
5903.64
1496.93
1110.31
761.42
1174.66
1823.83
0.263
MPb
280
75
110.36
3797.77
684.9
584.62
333.68
492.53
820.03
Sb
183
77.6
110.36
1398.62
467.36
234.28
300.66
419.64
584.64
Wb
97
70.1
128.07
3797.77
1139.17
797.3
595.8
945.58
1282.53
0.384
MPb
280
75
67.26
2287.28
425.27
402.66
184.93
292.92
538.94
Sb
183
77.6
67.26
2258.32
277.14
226.82
152.12
215.46
311.86
Wb
97
70.1
169.53
2287.28
734.61
501.75
394.54
564.37
836.56
0.617
MPb
280
75
10.75
884.6
131.72
141.73
43.94
73.26
172.58
Sb
183
77.6
10.75
388.74
77.96
72.55
32.83
51.79
85.39
Wb
97
70.1
54.44
884.6
243.99
180.02
128.06
183.72
272.84
0.954
MPb
280
75
0.51
289.42
34.58
44.56
6.3
14.27
49.16
Sb
183
77.6
0.51
102.71
16.67
20.46
4.74
8.21
16.79
Wb
97
70.1
13.22
289.42
71.96
56.47
34.23
54.46
86.63
1.61
MPb
280
75
0.1
66.64
6.39
8.7
1.49
2.8
7.94
Sb
183
77.6
0.1
19.52
3.09
3.4
1.22
1.84
2.81
Wb
97
70.1
2.89
66.64
13.3
11.79
5.67
9.07
16.28
2.41
MPb
280
75
0.08
25
2.14
2.99
0.61
1.14
2.48
Sb
183
77.6
0.08
6.28
1.1
1.04
0.47
0.75
1.15
Wb
97
70.1
0.96
25
4.33
4.28
1.85
2.78
5.27
4.02
MPb
280
75
0
3.69
0.3
0.45
0.08
0.18
0.34
Sb
183
77.6
0
0.98
0.17
0.18
0.06
0.11
0.21
Wb
97
70.1
0.13
3.69
0.58
0.66
0.21
0.34
0.63
6.63
MPb
280
75
0
1.89
0.16
0.22
0.05
0.1
0.18
Sb
183
77.6
0
1.89
0.12
0.18
0.04
0.07
0.13
Wb
97
70.1
0.04
1.48
0.26
0.27
0.1
0.15
0.28
Cut-off diameter of the impactor stage to which the line refers. MP: measurement period: January 1, 2010–October 7, 2010; S: summer April, 1, 2010–September 30, 2010; W: winter: January 1, 2010–March 31, 2010, and October 1, 2010–October 7, 2010. Arithmetic means for hours with at least 45 1-minute measurements.