Research Article

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 stageaPeriodNumber of 24 h concentrationcTime coverageMin.
(1/cm3)
Max.
(1/cm3)
Arithmetic mean
(1/cm3)
Standard deviation
(1/cm3)
25th percentile
(1/cm3)
Median
(1/cm3)
75th percentile
(1/cm3)

0.028MPb28075189.464543.991340.15858.22671.211097.381788.22
Sb18377.6189.463850.791274.52792.78636.671042.031760
Wb9770.1190.914543.991477.2966.62811.821271.661856.99

0.056MPb28075226.85367.991351.73878.88758.411086.641761.2
Sb18377.6232.673255.411173.78622.52704.251010.491539.38
Wb9770.1226.85367.991723.321171.32920.491352.372135.21

0.095MPb28075161.876895.541066.5874.03571.08850.561248.42
Sb18377.6161.872265.24832.06425.27491.44740.191035.76
Wb9770.1325.966895.541556.071275.57775.151145.231937.02

0.157MPb28075158.585903.641019.66775.49559.98822.471191.85
Sb18377.6158.582004.65791.1371.09518.55734.06995.12
Wb9770.1208.165903.641496.931110.31761.421174.661823.83

0.263MPb28075110.363797.77684.9584.62333.68492.53820.03
Sb18377.6110.361398.62467.36234.28300.66419.64584.64
Wb9770.1128.073797.771139.17797.3595.8945.581282.53

0.384MPb2807567.262287.28425.27402.66184.93292.92538.94
Sb18377.667.262258.32277.14226.82152.12215.46311.86
Wb9770.1169.532287.28734.61501.75394.54564.37836.56

0.617MPb2807510.75884.6131.72141.7343.9473.26172.58
Sb18377.610.75388.7477.9672.5532.8351.7985.39
Wb9770.154.44884.6243.99180.02128.06183.72272.84

0.954MPb280750.51289.4234.5844.566.314.2749.16
Sb18377.60.51102.7116.6720.464.748.2116.79
Wb9770.113.22289.4271.9656.4734.2354.4686.63

1.61MPb280750.166.646.398.71.492.87.94
Sb18377.60.119.523.093.41.221.842.81
Wb9770.12.8966.6413.311.795.679.0716.28

2.41MPb280750.08252.142.990.611.142.48
Sb18377.60.086.281.11.040.470.751.15
Wb9770.10.96254.334.281.852.785.27

4.02MPb2807503.690.30.450.080.180.34
Sb18377.600.980.170.180.060.110.21
Wb9770.10.133.690.580.660.210.340.63

6.63MPb2807501.890.160.220.050.10.18
Sb18377.601.890.120.180.040.070.13
Wb9770.10.041.480.260.270.10.150.28

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.