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Table 3 Descriptive statistics of daily average concentrations of ambient particulate and gaseous air pollutants and meteorological variables in Erfurt, Germany, between October 2001 and May 2002

From: Short-term effects of air pollution: a panel study of blood markers in patients with chronic pulmonary disease

Variable

No.

Mean (± SD§)

Min.

Median

Max.

IQR#

IQR5#

Number concentration [n/cm 3 ]

UFP*

207

6604 (± 3147)

1547

5972

18845

3827

2918

ACP*

146

1094 (± 773)

211

866

3886

907.3

914.2

Mass concentration [μg/m 3 ]

PM 10 *

208

17.73 (± 10.29)

4.38

15.03

57.27

11.43

9.91

OC*

208

1.04 (± 0.46)

0.43

1.04

2.87

0.52

0.37

EC*

208

2.60 (± 1.96)

0.40

1.97

10.63

1.98

1.76

SO 2 *

206

3.54 (± 2.61)

3.00

3.00

37.22

0.17

0.41

NO 2 *

208

25.37 (± 9.90)

6.54

24.94

55.74

12.94

9.70

CO*

208

0.42 (± 0.16)

0.14

0.39

1.07

0.17

0.14

NO*

199

13.32 (± 10.48)

4.00

9.63

56.43

11.30

10.04

Meteorology

Air temperature

[°C]

208

4.23 (± 5.49)

-12.83

4.79

15.71

8.13

6.85

Barometric pressure [hPa]

208

979.6 (± 10.5)

952.8

979.5

1002.3

14.6

11.8

Relative humidity

[%]

208

82.22(± 11.72)

48.75

84.40

100.00

15.44

12.27

  1. * UFP, ultrafine particles, number concentration of particles with a size range of 0.01 to 0.1 μm in diameter; ACP, accumulation mode particles, particles with a size range of 0.1 to 1.0 μm; PM10, mass concentration of particles less than 10 μm in diameter; OC, organic carbon; EC, elemental carbon; SO2, sulfur dioxide; NO2, nitrogen dioxide; CO, carbon monoxide; NO, nitrogen monoxide; § SD, standard deviation; # IQR, interquartile range; IQR5, Interquartile range for 5 day average