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Table 1 Descriptive statistics of pollutant levels

From: Health effects of the September 2009 dust storm in Sydney, Australia: did emergency department visits and hospital admissions increase?

Pollutant N Min Median IQR Meana Std Dev Max
August-November 2004-2008
CO (ppm) 610 0.06 0.36 0.29 0.42 0.23 1.6
NO2 (ppbhm) 610 0.55 2.05 0.79 2.05 0.61 4.15
O3 1 hourly (ppbhm) 610 1.57 3.38 1.08 3.62 0.95 8.73
PM10 (μg/m3) 610 10.57 34.69 18.53 38.84 23.13 258.18
PM2.5 (μg/m3) 610 3.3 13.83 9.47 16.08 12.39 174.42
SO2 (ppbhm) 610 0 0.21 0.21 0.25 0.17 0.9
Rel. humidity (%) 610 26.5 65.89 16.67 64.63 12.58 91.26
Temperature (C) 610 7.12 15.45 5.98 15.66 3.95 28.28
August-November 2009
CO (ppm) 122 0.13 0.47 0.36 0.54 0.25 1.24
NO2 (ppbhm) 122 0.25 1.81 0.92 1.85 0.62 3.33
O3 1 hourly (ppbhm) 122 2.03 3.25 0.73 3.42 0.73 5.99
PM10 (μg/m3) 122 13.95 38.48 31.42 165.75 1156.62 11704.8
PM2.5 (μg/m3) 122 4.22 14.66 15.53 34.13 161.05 1637.82
SO2 (ppbhm) 122 0 0.22 0.18 0.24 0.18 0.89
Rel. humidity (%) 122 35.29 65.97 18.4 63.88 14.16 89
Temperature (C) 122 8.37 15.37 5.05 15.41 3.41 27.5
23/9/09-6/10/09
CO (ppm) 14 0.13 0.36 0.3 0.44 0.23 0.82
NO2 (ppbhm) 14 0.25 1.49 1.06 1.63 0.83 3.18
O3 1 hourly (ppbhm) 14 2.7 3.11 0.34 3.2 0.41 4.12
PM10 (μg/m3) 14 14.07 47.57 43.75 925.25 3108.95 11704.8
PM2.5 (μg/m3) 14 5.58 12.5 18.3 137.85 432.57 1637.82
SO2 (ppbhm) 14 0 0.11 0.19 0.13 0.1 0.29
Rel. humidity (%) 14 35.58 52.2 38.12 59.51 20.64 88.54
Temperature (C) 14 12.2 14.65 3.27 15.19 2.46 20.8
23/09/2009 b
CO (ppm) 1     0.33   
NO2 (ppbhm) 1     0.56   
O3 1 hourly (ppbhm) 1     2.98   
PM10 (μg/m3) 1     11704.8   
PM2.5 (μg/m3) 1     1637.82   
SO2 (ppbhm) 1     0.06   
Rel. humidity (%) 1     48   
Temperature (C) 1     17.52   
  1. aArithmetic mean. bConsists of 1 measurement for the day 23/09/09.