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Table 2 24-h-averages of air pollutants and meteorological variables between October 2000 and April 2001

From: Ultrafine particles and platelet activation in patients with coronary heart disease – results from a prospective panel study

Variable

N

Mean (± SD#)

Min.

25%

Median

75%

Max.

IQR††

IQR†† 5-day average

UFP* [n/cm 3 ]

196

12602 (± 6455)

2542

7326

11444

17332

34294

10005

6821

AP* [n/cm 3 ]

167

1593 (± 1034)

328

821

1238

2120

4908

1299

1127

PM 2.5 *[μg/m 3 ]

197

20.0 (± 15.0)

2.6

9.7

14.9

26.1

83.7

16.4

12.2

PM 10 *[μg/m 3 ]

154

20.0 (± 13.0)

5.4

10.8

15.6

26.0

74.5

15.2

12.8

NO [μg/m 3 ]

196

24.4 (± 27.7)

4.0

6.8

12.3

30.3

137.6

23.5

21.0

Air temperature [°C]

198

4.1 (± 4.8)

-10.4

0.5

4.4

7.9

13.2

7.4

5.9

Barometric pressure [hPa]

198

973.4 (± 9.7)

949.5

966.3

972.9

980.0

995.7

13.6

10.8

Relative humidity § [%]

198

83.5 (± 8.8)

55.8

78.9

84.3

88.8

100.0

10.0

9.1

  1. * UFP, ultrafine particles, number concentration of particles with a size range of 0.01 to 0.1 μm in diameter
  2. 13% of the hourly measurements were imputed,
  3. AP, Accumulation mode particles, particles with a size range of 0.1 to 1.0 μm,
  4. PM2.5, mass concentration of particles less than 2.5 μm in diameter
  5. 15% of the hourly measurements were imputed
  6. PM10, mass concentration of particles less than 10 μm in diameter
  7. † NO, Nitrogen monoxide;
  8. ‡ Temperature: 0.5% of the hourly measurements were imputed
  9. §Relative humidity: 0.5% of the hourly measurements were imputed
  10. # SD, standard deviation
  11. †† IQR, inter quartile range